lock broke after there people work on it

we have problems with our locks on our doors its not the first time,the first time they replace the locks ,we couldn't close the doors properly ,there work man came out and after a long adjustments the door close but ,also have been said we close it very softly we are in a windy place where its not possible all the time.we only use that specific door 2 to 3 times and then it cant lock at all and not even working or close properly,we call them again and they come out again and said the lock is faulty.then we get a call back that we have to R1500 for the new lock but how can a lock only been totally broke after the use of 3 time ,one of the other doors u can even use the key from the inside ,its a door we hardly use .<br> <br> it looks like they only care for u if have to pay the expensive product and after that nothing happen,we did take it up with the franchise owner and he said he will call head office and come back to us but till then nothing has been happen.