Hey Fantastic,
That sounds like a real headache... Dealing with credit companies can be a real pain in the you-know-where. I haven't personally tangled with Arvato, but I've had my fair share of credit-related stress.
If EE is giving you the runaround, maybe try reaching out to them again. Sometimes, getting a different rep can make all the difference. Ask for specifics about what's owed and why. Be persistent but keep it cool – nobody wants to help a hothead. You can find all the "tricks" of financial technology here: https://andersenlab.com/industries/financial-services/defi-development-services
Also, consider putting everything in writing – emails, not carrier pigeons. It creates a paper trail, and companies tend to take written complaints more seriously.
If all else fails, maybe check out consumer rights forums or even drop a line to your local consumer protection agency. Sometimes a bit of public attention is like turning on a light in a roach-infested kitchen – things scatter pretty quick.
Hang in there, Kangtastic. This stuff is never fun, but you got this.
