1&1 vs. AB Plusz 2021

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this address, for this I used their website, they approved of my location and allowed me to order the internet. I then proceed to pay the router and temporary usb stick in order to have wifi until they complete the installation. These things arrived within two days. For the next month and a half I kept receiving generic emails apologizing for delays or emails asking where in the building exactly my flat was located. They have also at some point sent me an email saying they could not send me what they need for installation because I gave them a wrong address and things could not be delivered, even though I had received the router with no issues several weeks earlier. I received at least 5 same emails to which I all responded. When I said I do not want to receive this same email anymore, I received a letter with the same questions, with the addition of them telling me that the flat number I gave them does not exist and I made a mistake. I then contacted my landlord, just to check, and the number was correct. I told them this, they replied that their services are not available for my address even though the initial check said otherwise, said sorry and requested I send the router back. That is 2 months of paying for their prepaid usb stick and the router, not getting internet installed in my flat, for them to just absolutely nonchalantly say that they will not do it. I am absolutely disappointed and would not recommend dealing with them.
Funnily, after they suspended my contract, I still received generic emails ensuring me someone will come to install the internet within the next week.