Account Canceled but still getting billed.

I was contacted by NuDebt Management on behave of Telkom to pay may outstanding TELKOM 8TA MOBILE account (Amount outstanding R498). This was on the 25 July 2015. The amount was paid to the account (Account Name : NuDebt Trust Account,Bank : ABSA,Branch code : 632005,Account Number: ***,Reference number : ***) on the 27th July 2015. At this stage my Account has been suspend for 3 months already. I instructed NuDebt Management that this will be seen as my notice of cancellation on this account with Telkom and any future deductions form my account will lead to legal action to be take. Now again I'm receiving invoices 3 months later and my account is begin debit as well. Please inform if i should proceed with legal action or will Telkom come to the party and resolve this issue.<br>