I had two sets of keys with my "new" vehicle but the driver's side lock servo (the one and only) didn't work, and it had jammed open.
I took the car to my local Vx workshop and they billed me 47 pounds just to have it in their shop
plus 150 for the repairs. The car was in there for a week, as they couldn't find a new lock, so i collected the car and waited for them to order a new lock from Germany, to be fair they then let me off the 47 pounds fee.
A couple of weeks later they called me, part arrived, and duly fitted - perfect! I called to find out the bill and they said 147 pounds incl. VAT.
Arrived to collect the car and they wanted 247 pounds...i stuck to my guns and politely argued them down to 204, then 147 pounds as that's all i'd brought, cash only i don't have credit cards, and the time was getting on to closing and busy with other customers waiting

happily paid and got out there fast in case they thought of something else to charge me for

lucky i didn't use the mini bar...
