Mistake to stay with Vodacom Fiber

My fiber was on a 100Mbps line, and I upgraded to 200Mbps. All the approvals were done 25 February 2025, and it was confirmed that my line was upgraded. Came home after work and decided to test the line, even with a Vodacom website, and there I got 89 / 90Mbps Upload, and same with download. I logged a call on the app immediately. Since 26 February 2025 I sent print screens of the line every morning to Allistair who was assigned to my log. All of a sudden Allistair disappears and another lady phoned me. I told her that I communicate with Allistair daily, although I don't hear from him. I found out now, the 8th of March when another lady phoned me and asked if my problem was resolved, that she opened another ticket and closed it and said in the comments I refused troubleshooting. How in this world will I refuse troubleshooting if I want my line fixed. This morning (11/03) I totally lost it with Vodacom. I wanted to move to another company, but Vodacom came back with a deal to keep me as client. So, this morning, I asked that my contract be cancelled, since I already received an invoice for pro-rate payment and the new monthly amount payable. The lady said I'm still responsible for the monthly bill for the contract, but how can I pay for something if Vodacom can't provide the service from their side that was requested and agreed upon. We are already paying for a lot of things in South Africa that is not working, and I'm definitely not going to get *****ed by another company, by taking my money on providing the service as per agreement. How in this world can't they sort out a simple problem or find a solution with qualified technicians, or maybe not so qualified technicians. Vodacom, if you will have the decency to respond to my complaint, please check out the SR Number first. All I get is apologies for your *********** technicians and helpdesk staff, but no solution.