Telkom Bad Customer Service

Last year on 30April2018 I cancelled my Telkom account. I went into the Old Mutual Telkom branch but was told I had to do it online and they could not assist in the branch. An online request was sent on 30.04.2018. Three emails were received by me from Telkom on 30 April18 acknowledging the 'cancel service request'. I also received SMS on 21 Sept2018 saying that the 'case number is resolved'. Today (02April2019) - almost a year later - I received a call from Blake and Associates (debt collectors) who were following up on unpaid accounts on behalf of Telkom. Can this be resolved please?