Unhappy Customer

I have been a Vodacom customer for more than 20 years. I have been trying to cancel one contract and changing another contract since June 2020. Every time I call, they promised me that my request will be completed. When I call again to follow up, I am being told that it was not done. This happened with +- 4 agents. When I request a reference nr, the one will tell me she cannot give me one as she is working from home. The other agent will tell me that I will receive an email during the course of the day and so it will go on. My last straw was on 18 Aug 2020 when I spoke to Amanda. She was gonna cancel my data contract and request a refund for July and Aug and she was gonna change the contract with my main nr. She gave me ref:*** and ***. Guess what, I called today and Lewis told me that nothing was done. He was so kind and tried to assist me, but I was not going to repeat myself. I requested that a supervisor or manager call me. He said that he will relay the msg, but cannot promise that they will call me. So this is my last resort. I hope that I will receive the service I deserve as a loyal paying customer.