7 months since line cancelation and still getting bills

I ended my line rental with telkim in march already paid the last month like they told me to and since then still geting bills. Been to the local branch multiple times with no re****s phoned multiple times with no results. So glad i dont have a debit order. But ahould this syart to reflect poorly on my credit record telkom wil surely be sued for any damages incurred. So please will someone competent phone me to resolve this issue.