Continued Cancelled Account

I moved out of my place at the end of December and cancelled my telkom ADSL account the 1st week of January. I went to the store personally and filled in the form in store and gave it to the young lady behind the counter. I kept getting messages which i thought was a mistake.In March I get a message saying the account has been suspended and I owe over R3000. I find this unacceptable and very upsetting as the reason I went to the store was I thought it would be more reliable. After weeks of communication I get a response that no paperwork can be found on the system and I must cancel the account which is exactly what I did in store in January . Now I'm responsible for this account that hasn't been cancelled due to inefficiency from Telkom's side