Fuck Vodafone Germany in particular. I had a cable-contract that was rock solid for years until it wasn't. No amount of calls and complaints was able to convince them to do anything.

First, it was clearly a problem in the house.

Weeks later it suddenly was a regional issue that needed massive infrastructure updates.

Then it became a problem caused by a single household creating massive interference, that they need to find.

Months later they went back to infrastructure updates.

After 9 months of this shit I reported the issue to Bundesnetzagentur.

My next call to Vodafone and they "suddenly" offer to reduce my monthly subscription fee. After threatening to call the BNetzA again, they also offered to payback part of the fees of the previous 9 months.

The problem was magically resolved 3 months later. I'm on the reduced monthly fee ever since. They have forgotten to raise it back to normal and I'm not reminding them about it because they have been such assholes about it.