Zero communication, no access to invoices

I have been struggling for 2 and half months to obtain my own invoice. It is apparently not possible to download from the website anymore. I have requested this about 50 times on the app - you can select it on the app, but when requesting I get a msg saying that they are unable to process the request. Numerous calls later, every time logging a call, speaking to TLs and so on, it took more than 2 months for them to admit that there is a problem (system change) but as i am now holding on for 45 min - still no solution. And worst of all, no actually communication. Numerous open tickets logged, all unresolved, no feedback, no comms. Can't wait for the current contract to expire so i can end my relationship with this company!