Telkom - No response on any medium

On 10 May 2018 I went to our local Telkom store in Vaal Mall to cancel all my services with Telkom. I was instructed that I could only do this using their online service. I proceeded cancelling all my services on 10 May via the online service and received the following reference numbers ********** 6 and ********** 0. I do understand that I have to give 1 Month's notice, thus when I received the my following statement which was for services up to 11 June, I paid the account as it should have been my last account. On 13 June I received another account for up to 11 July, which I queried. I phoned Telkom (with the customary 15 minute waiting period until someone answered) and I was told that my issue will be escalated and that I will be contacted. By 28 June I was still waiting for someone to phone me back and decided to phone again. Again I was told that the issue will be escalated. Today I received the next account for usage up to 11 Aug and I am now 2 months in arrears with my account. This is unacceptable as I haven't been using any Telkom service for close to 3 months now already and followed the procedure to cancel my services as instructed - I also paid for the notice period of one month! Besides phoning Telkom I also tried to contact them on Twitter no success.