Internet switched off every evening for the night

We moved to Mweb recently and since then our internet access has been extremely poor. We reported it the beginning of February and were told that we had to wait 7 to 10 days for the problem to be fixed. They see nothing wrong with us not heaving a service for 2 weeks which we pay for. Take note. it does not mean your problem will be fixed in this time. You have to wait this long before anyone attend to the problem. Eventually, after this time has expired, a lady from Telkom came out to check the line. She saw that while Mweb does provide for a 4 meg line, Telkom only provides a 2 meg line. She fixed this problem. However every evening at around 5pm our internet service is taken down until the next morning around 8am. Which is the time we need the internet most,. I have reported this problem to Mweb but so far nothing seems to be done. In this month I have spend over R2000 for mobile modems and expensive data so that we can do crucial business. I really do not know what more to do to get the service we need and pay for.