Please help - I have paid for upgrade yet has not been upgraded.

I have had no other option between Vumatel and mweb I am playing a game of ping pong. I have updated our wifi online, received the invoice and confirmation, been charged on my bank account. Yet my line is still running the same speed. Please can someone assist if possible. We just need what we are being charged for and no one seems to want to help at either company but they are more than happy to take my money.