"Nearly got wrong vaccination!"

My husband an I made appointment for travel vaccination through Masta at Boots, only to find when we arrived that Masta had told the pharmacist to order the wrong vaccines. Fortunately he checked with us before pumping us both full of the wrong chemicals. We therefore wasted both time and money on fares to get to Boots. Masta deny the mistake is theirs and will not agree to compensate us for the money we have lost.
The appointments were hard enough to get on a Saturday as Masta have completely indequate numbers of appointments available at times convenient to those in full time work and now we have had to rearrange at great inconvenience on weekdays and on different days to each other.