No internet connection

For 2 months the network was working perfectly then on the 21/08/20 sh*t hit the fan. I have not had any connection for the past 14 days I have been calling the contact centre day in and day out but no one seems to help. A replacement sim card was delivered but I am still experiencing the same issue. Every single day I try changing the APN settings and doing the diagnostics but nothing is helping. This is really frustrating because it's almost half a month without connection yet when the debit order is due the full amount will be taken.. I am so so so disappointed with the service I have received.