Billing query

My name is Bongani and I app**** for a contract with telkom in January for a pocket router, my installment was R239 monthly plus I had a credit of R500 to buy data if the initial data was depleted and I reduced the credit to R300, due to the covid 19 pandemic things have been tough financially and I took a decision to cancel the contract because I don't want to find myself blacklisted. After cancelling the contract a guy from telkom called me on the 11 of May to advise me that I was still new on the contract so the obligation fee will be too much, rather I downgrade my contract for R100 a month, then we had an agreement, my areas where R538 for the month end of May. I paid those areas then for the new month which is June I received a new invoice which is R1031, then I called the customer service to find out why, I spoke to a guy named Sihle, he said to me the reason my amount is so high is because of R731 devislce obligation plus R300 for subscriptions, then I asked which subscriptions because I never subscribed to anything it's a pocket router, and to me it seemed like he didn't know what he is talking about then I asked him to call his supervisor, then he said the supervisor will call me back in two hours, I'm still waiting for the call even today. Today I called again and I spoke to Simphiwe Makhathini, she told me about the obligation fee for the device which is for the remainder of the contract, which is 23 months, then I asked her whether if I pay that obligation fee will I still be paying for the device monthly because for the device I'm paying R39 multiply by 21 months it amounts to the obligation fee minus the discount I get. Then my question to Simphiwe was why should I continue paying for the device if they are going to debit me and obligations fee which amounts to the price of the devise, and why do I have subscribtions on my Sim card, and why is telkom debiting my account on behalf of a third party company because my agreement with telkom is for them to debit for the device and data, she said she is going to confirm the Imformation for me then hung up my call, then I sent her an email, and her response was that I'm liable for the amount including the R300 subscription plus obligation fee and I will still be paying for the device. So since I'm not getting any help from telkom I'm going to close the current bank account and open a new one, I will not be ****** by telkom