Broke my working iPad

I went to Experimax tygervalley to buy a new screen for my iPad. I was gonna do the install myself as I have done it a few times before. In store I was persuaded by the staff to rather have them handle the installation cause it is already included in the price. The following day I brought them the working iPad with the broken screen already removed. A few days later the technician called me and said that the screen is installed but he noticed some of the pins by the connection point is bent. This caused a dead spot on the screen. I told him I was aware of the dead spot and asked if he could not try and bend the pins straight again to fix the problem.He agreed to check it out. 3 weeks later I still have not heard anything so I decided to go in and see if it’s done. They gave me back my iPad , but the battery was dead so I could not check it . I charged it the whole weekend but still it did not come on. A bit upset I took it back to them and they said they will sort it out. To make a long story short they now claim the iPad was compromised when I brought it in initially and then gave me back the broken iPad and tried to send me on my way. I was furious at the cheek of these people. I gave them a working iPad, compromised or not, and they hand me back a broken iPad and then tell me I broke it so it’s not there problem. This is the worst customer service I have ever had and I will be laying charges at the police for damage of property and defamation of character.