Halfords and bulb fitting!

We have a local Halfords store and every time a customer goes to buy bulbs the staff I believe are instructed to ask the customer if they would like the bulbs fitting, I don't know what the current charge for fitting them is now but they used to charge £12. Anyway headlamps are a real pain now after Halfords have fitted bulbs, they never get the bulbs fitted correctly and has an effect on beam image every time, I have tried talking to the lads that fit the bulbs and explain about locating the bulbs correctly in the headlamps, but all I get is we are not mechanics and are not qualified, then the lads try and turn it round and make me out to be the problem, is there a solution to this problem as customers can be quite off about it having just been into a Halfords image focused business using staff who blatantly admit to us they are not competent to do the job, but I get the impression the customer thinks its the test station at fault!