Email Apple about poor support

Hi,

I don't know if this is the right section to ask for this but couldn't find any appropriate place.

I had my rMBP's screen changed a month ago and all, apparently, went fine. It took about 20 days to repair at the shop I bought the MBP (actually they sent it over to an Apple authorized repair center but I handed the computer to them).

When Apple emailed me about how the repair went and how happy I was with the work done I said that all was fine and that I was happy with it. Thing is, some days later, I noticed that the left hand side of the lid is kinda loose (I can move it front and back even if closed) and a screw on the bottom cover was loose. Ok, this is all but good work mainly if we're talking about a company such as Apple. I really want to do something about this but I don't know if going to the retail store where I left the laptop at first is enough. Maybe they will just send it over again to solve this and nothing will happen to whoever repaired my MBP (and I'm going to the Apple Store in London on Saturday to repair it since I'm here on vacation). I just want to make sure that Apple knows what happened but I can't find any proper email. Can you help me, please?

Btw, am I overreacting or would you do the same?

Thank you

Thanks.

I still don't know what to do but I'm probably going over to the store and try to know to what support team they send Macs for repair. Then I'll think about what to do.. I just want to make sure something happens to the responsible people or at least let them know they have a dissatisfied costumer.