Bad account service

I cancelled by line with Telkom on the 26/01/2019. We moved on the 1st of February. I waited for a final account which should have includes a deduction of R700 for a deposit paid. The next minute I receive email from a debt collection agency telling me the line will be suspended and I have to pay this account. I have since paid the full January account bit have received accounts for Febr and March. Unacceptable and unprofessional!!!!!