Since having this done they have squealed and smelt but the garage explained this was the bedding in process and no cause for concern so i continued to drive. The other night getting home i noticed constant squeal and discs became too hot to touch. I took it back to garage this morning to be told the pistons had now seized in calipers and binded onto discs

. They now need to strip down brakes and order some new dust covers for the pistons which will take 3 days and cost £10.22 each. I told them this is their mistake as the first job was not carried out correctly and i will not be paying for anything!
Just looking for some suggestions as to what they have done wrong as i want to sound as though i know what im on about when i set about them if they try to bill me.
Thanks.