Bad technicians

I booked my device in for screen repair at Wefix Canal walk. Firstly I waited an entire month for my device to be repaired, I finally got an email saying my device is ready for collection. On collection I noticed that there was a piece of glass stuck in my rear camera, which the assistant in store had not even noticed while doing the quality check. I was told by the region manager that this would be fixed within 30 mins and I would be able to collect the device. Once I returned to the store 2 hours later they still had not even attempted to fix this error. I then had to book the device in for another repair to get this fixed due to their negligence. In my opinion this is extremely bad service , not only did I have to wait a month for the screen to be replaced ,the person who did the repair did a **** job. Who knows how long I'll wait for my device to me completed this time. For an authorized Samsung service center I did not expect this poor service quality. I'm very disappointed