Complaint (Vodacom Fiber)

I previously had a 20/10 mbps Fiber contract with Vodacom. I upgrade to the 50/50 Mbps contract in November 2021. Since my upgrade, I never received the 50/50 Mbps. I reported the issue numerus times, with no luck. My first service request (SR***) was closed without any technician contacted me. When I called the Vodacom line (***) they said that I was contacted and the issue was resolved. After I explained the them that the issue was not resolved, another service request (SR***) was opened. The assistant on the other line told be I have only a 50/35 mbps contract. I emailed them (Aviwe Mazonda) a Vodacom Tax Invoice and a speed test on their request. And, yet again no one called me since. I am paying for the 50/50 mbps line, but I do not get what I am paying for. Please give me some advice.