I agree with the bad workmanship and the problem seem localize to that specific branch. They don't have the proper skill to install it and probably try to to cut cost by giving some substandard or rejected tints. However what i don't understand is why would they want to take one of your reverse sensors? It doesn't make sense and that's quite a claim saying they took it. Anyway please write in to the HQ with regard your issues. If there's QC problem with that branch, I'm sure the brass at HQ would want to know about it.