Pathetic Service

I recently upgraded my line from a 40mbs to 100mbs, but i am only getting 60mbs line speed and the excuse is that my 6 devices are using up the line speed. I explained that with the 40mbs line I had the same amount devices connected and the line never dropped below 35mbs. And they couldnt give a reason as to why the 2 lines were so much different. I have chatted to 3 different agents on the Whatsapp platform and all 3 times I had to go through the same process with doing speed tests, eventually the fault was logged and I received a call from Vuma to say they made some changes and it will be sorted. A few hours later the line speed dropped to under 40mbs. I requested for a manager to call me on the 19th of November and I was advised it takes 24 hours until that I will receive a call, I once again sent a request on the 21st of November and again I was told it takes up to 24 hours. It is now the 25th of November and still havent received a call, I sent a email to their complaints department on the 21st of November as well and still no assistance. I Have tried calling on their contact number and that number also doesnt work. This is not the first time i have experienced this extremely poor service from Webafrica