Vodacom fibre be careful before having it installed

I have Vodacom fibre and every month around the 22nd to the 25th my speed drops to around 3mbps. I call in and make sure that im not being throttled and explain my situation. They magically fix the issue but low and behold next month rolls on and I have exactly the same issue. Nobody at the call center can explain it. Secondly lately around 1130 my connection drops completely. I am so frustrated as you never get answers or a solution to the problems.