Cool ideas threatens to blacklist me for a service i cancelled 2 months ago.

After numerous amounts of calls asking to cancel an account that was under my name, which my abusive father paid for, they continuously kept sending me invoices for services that he used while I was hundreds of kilometers away DESPITE the fact that ive asked to cancell the services and account more than 10 TIMES which i hae email proof of, they told me its simply not their problem and are now threatning me and saying they are going to blacklist me due to an unpaid invoice WHICH MY FATHER used durind their services. Ive called them over 15 times, ive opened 6 tickets at this point, and I still havent seen ANY progress or ANY response from them, and now, thanks to the fact that I have proof I'm willing to take legal action against them due to them simply ignoring my emails and now suddenly threatening to blacklist me. Never go with this company, they advertise that they have a simple "month-to-month' contract, but. will immediately threaten to blacklist you if you cannot pay for a service THAT YOU NEVER EVEN USE. NEVER choose this company, NEVER,

To this day, I am still stuck with this problem, and they simply couldn't care less.