Telkom - Bullies who seem to be above the law

2016 Telkom rep came to our office to sell us a LTE device. He confirmed there was coverage for my office. Once the device was delivered we had no service. I contacted Telkom and they said I could not cancel despite breach of service delivery. SO I tried to use it at home but they would let me upgrade to Uncapped. Then I went into Telkom Ballito and they said they have to send a technician to confirm no coverage. This was done. Again I went back to return the mobile device. They told me I had to complete a Customer Request for contract and service cancellation - we did this and emailed it to ********** on 5/10/16. No response. Case number ********** 0 was given when we called on 8/9/16 spoke to Penny Khanyi again 5/10/16 said it would be escalated. We have proof of all correspondence. Telkom refuse to cancel despite this not being used to date they owe me R5000 plus in debit orders. In 2017 I moved banks and am now receiving threatening sms from Nu debt as they can no longer debit my account. I have emailed all the details to Nu Debt with no result.