Unresolved claim

I am very disappointed with Iwyze service, my wife car was broken into and they broke the front driver glass, so we did a claim for the broken glass and the glass was replaced, however now my glass will not close as normal, we been 4 times to the glass company to have this issue sorted but they said that the button for the window is not functioning as normal and cannot do anything to resolve, they then asked Iwyze to send my vehicle in to the agents for a diagnosis which iwyze agreed to and the agents found the button to be faulty and requires replacement, but iwyze refuses to pay for this. Bottom line is, my window was working 100% prior to the incident that happened and Iwyze now makes it seem like we the client are not being honest. I will not settle for this, I have full comprehensive insurance with iwyze and I expect them to resolve my issue.