Cell-C Fiber are bunch of *********, *****, & *********** technician wannabees - Dont joint them

I have recently upgraded my Speed from 25Mbps to 50Mbps, but it looks like I made a mistake because my speed has gotten worse than 25Mbps. Since then I have experienced buffering on everything even Instagram on my phone is buffering, my downloads are way slower and they take forever. When I call in they take me from pillar to post, telling me one thing after another. they asked me to send speed-test images and I did and they never called me and I had to call them to ask why they haven't and one lady told me I need to change the yellow cable connecting Metrofibre Blackbox to Technicolor as the one I have cant handle 50Mbps. I specifically asked when I upgraded if anything will need to change but I was also told that technicolor can also handle 50Mbps which is contradictory that I am now told to change the cable and still I wasn't told what cable to buy. Now I called in again for the third time and I was told I need to send another speed-test image which indicates the level of incompetency Cell-C staff has. I regret ever signing with Cell-C because they are worse and they can never solve anything and when I asked if they can't send a technician I was told I will need to pay for it, when what am I paying every month when they cant afford to get me a technician to solve their problems ( I didn't cause the problem they did, and I have to pay a technician to solve the problem they created, now that's an insult). Now I am paying more for 50Mbps when the service speed I am getting is worse than 25Mbps. I asked they to send a proof that my upgrade is done, and they still have nothing to show for it. I am being cheated out of my money and if this is not fixed this week I will have no choice but switch to another service provider who is reliable and actually solves customers problems not seat around and do nothing. After upgraded I saw difference of speed improvement for only three days and it went down the drain when every device started buffering. All I wanted was an improvement on quality on my smart-tv to view 4k, and now everything is worse than it was before. Cell-C Fiber are bunch of ********* pretending to upgrade me & solving nothing, & taking my money for free. To make matters worse my WIFI connection disconnects every hour and I had to retype this message when I tried to sent it. If I dont get help on Tuesday 24-05-2022, I will start hunting for a better service provider and I want a refund for a service not rendered. I am not enjoying my internet as I can't even download or upload large files without cutting off in the middle of it and I have to start again, this ****es me off. Why didn't you tell me you can't handle 50Mbps upgrade, then maybe I would have given up on wanting 4k quality and stayed with 25Mbps which is way better than the ****ty connection I am now receiving. You better solve this nonsense. These bunch of circus fools even closed service request ticket without helping me not even once.