"Rude conduct, unreasonable customer service and unacceptable manners."

I was recommended Les by my father as 'the man to go to' for any Naim hi-fi equipment and I was excited by this prospect. I have (or should I say 'had') a Naim Nait 3 which was in need of a service, so I telephoned Les who told me to send it down to him. On the day I sent it I telephoned to check the best postal service as I was worried about placing such an item in the hands of a courier. I spoke to his wife, who was lovely, she put my mind at rest and told me Les would be expecting it.
This was at the start of September. Three days after I had sent it I became a little concerned as I hadn't had an email to confirm receipt. I sent an email, but got no response. Several days later I tried to telephone but got no answer. Again I sent another email, but got no response. This went on for a couple of weeks. I checked the couriers website and found that the amp had been signed for, which gave me some relief.
Weeks passed and I heard nothing on the status of my amp. I sent another email, but received nothing back. Finally after a couple more phone calls I got an answer from Les who told me he was on holiday and that the amp had arrived safely and that 'someone' had signed for it. I was told that it had been serviced and all he needed to do was check it when he got home and that it would be back with me soon after. I waited another week or so - but received no amp, invoice or correspondence. By this time, I myself was going on holiday. I wrote to Les again to say that should he try sending it back to me to hold off until mid October when I would be back - I received no response. When I returned home I checked my emails, still nothing. So, again I chased it up and again my emails were ignored. Eventually, I got a response telling me that the amp was good to go and that he just needed an address (a covering letter had been sent with the amp, so this had obviously been lost). I quickly responded with an address and expected my amp and invoice to be with me that week. Sadly not. So - again I emailed and again I received nothing back. Today, I telephoned and got a reply - I explained, very politely, who I was and what I was waiting for. As soon as I had Les became very abrupt with me and gruffly told me he had sent an invoice. I told him I had not received it. Then he became very rude and argumentative and told me that because another client had 'done him over' I would get an invoice before I got my amp. I have no issue with this, but I don't even know if it HAS been repaired. I didn't manage to say very much - instead I had Les shouting over me as I tried to speak. When I told him that I was unhappy that he had had my property for so long, without even a word as to its whereabouts, he told me that he was doing this as a favour and I should be happy! I remained calm and explained that this was not a favour and was in fact a service that he advertises and that I was also paying for. I asked him how he would feel should someone take as long paying for an invoice. He told me 'the world isn't a fair place'. I am unsure as to how this was even a point of fact. I told him I didn't think it acceptable to be talking to a client the way he was now talking to me - he told me to 'put it in a letter' and he put the phone down on me. I gave it a few minutes as I wanted to know if my amp was fixed before I received and paid for an invoice. This time his wife answered. She told me Les ended the conversation as 'he could see where it was going'. Which makes me wonder if this has happened to clients before. I asked her if she could see my point of view, which she said she could but then also added that I had been on holiday. I am unsure as to how my two weeks away had any bearing when the amp, according to Les, had already been repaired at this point. The fact of the matter is, I could live with the length of time this has taken, had he just told me so. Had he responded to emails - or if he had been honest and told me that he didn't have the time to repair it. Instead I have been worrying about where my property is - or STILL is. Something I worked hard to pay for and that Les showed no respect for. I am bitterly disappointed as Les did not live up to expectations. I STILL don't have my amp back, nor have I received an invoice after I have asked for it to be sent again. My next step is to take further action after having taken advice from the CAB.