Bad Service and no Resolution to my problem

I have been an Mweb client since 2016 and in all that time the highest amount of data used was 80% yet............now is a different story. Yes it is Covid - but at the height of lockdown which was April when all of us were at home full time and all using internet 24/7 - we never ran out. May comes and I am based part time at work and part time at home - yet we run out of data. So I get a package that supposedly offers us more data. From 1st June I am at work full time - 17 June I get notification that data used is 50% - so I tell my family to slow down - which they duly did - I phone to query something with MWeb and so happened to ask what the amount of data I have left is - this was 24/6 and I was told 5gigs. I got no notification either via SMS or email that data was at 90%. +/- 9hrs later when we have barely been on the internet - data ran out! Since 19th May I have asked for someone at MWeb to investigate what is going on - and I get sent from pillar to post dealing with one person after the other and still no resolution. I did not receive data warning notifications as I am supposed to and because of MWebs system errors and who knows what other errors on their side - I am now a customer with no wifi internet. The package I have is 150gig day time data and supposedly uncapped night time data however it is now 00:34 and my supposed uncapped night time has still not kicked in and I am now only able to connect to certain sights - my son says SA server sights.