Terrible, terrible service

I have been an Mweb customer since Jan 2020. I have been trying to change my contact details and upgrade my package for 2 months now. I have called more than 40 times over 2 months, sometimes holding for up to 2 hours. I have called all 3 opti9ns listed on the website. Of course, sales & technical say they can't assist and I need to speak to customer care. THEY DO NOT ANSWER! I can't use my app because I meed the otp that is going to a number that I do not have any longer. All smiles when you sign up, but no back up. I am at my witts end and don't know what to do.