Closed account still being billed

This credit card was paid up in full in 2012 and then closed. Subsequent to this, I have received accounts from Blue Bean about outstanding service fees. This matter has been taken up with them on numerous occasions and every time I receive an apology with the promise that this account has now been closed and all charges written off. <br> <br> I have now yet again received mail from them with regards to my account being handed over due to non-payment of service fees!! I have contacted the call-center as well as all departments via email and everyone just passes the bucket on to the next department. In the meantime, I keep getting threats of legal steps on an account that is non existent! I am a business owner and my credit record is important to me. This matter has now been going on for 4 years!!