LTE Dips in speed upon use, please fix this!

For the Last two months i have been experiencing very shoddy internet, I'm on an LTE Cell C package through mweb, I'd expect after paying mweb for them to sort it out. I've wasted alot of airtime calling their technical support and they all reassure that they will get back to me.

I'm now broke so i can't keep calling them, wasting money trying to remind them i exist, why should i pay what im paying for this service?

I work from home so i heavily rely on the internet and i play games, i can't play online anymore, im stuck in low priority in dota because of disconnecting and lag, i can't play on a server because the lag is just terrible. I was promised up to 30mb/s i get 6 at best but somehow it dips the moment i try to do anything!

Either replace the router or fix the line, it's now gotten so bad that the only time i get somewhat decent internet is in the morning. I do not wish to make another wasteful phone call to mweb only to be told it's being sorted out, IT'S TWO WEEKS since my last call!

Should i just call Cell C direct? Can mweb technician reset ports or check what is happening with my line? I get full bars and im in a covered area.

On top of that every now and then my router light turns red and flashes back to light blue every couple hours, why can't someone just experience what they're paying for without all the problems? If i buy data for my phone i DON'T get dips in speed so why is LTE so FREAKING FRUSTRATING?

Also despite my shoddy internet im still managing to use up my cap? please explain?