MTN worst network provider

I took a contract sim card with MTN in December 2020 and it has not been a month yet and I am already on my third problem with them, firstly the MTN helpline is completely useless as no one ever answers the phone and you never get to speak to an MTN adviser, it's only the automated services that's active and that too is useless! Secondly when you email customer care they take a couple of days before they respond to you, I am currently waiting 7 days now since my last email to them. Very unprofessional I would say! Earlier in the month my sim card was deactivated and I was forced to go in to a store to get assistance as no one got back to me over the phone or email. I received an sms stating that my account is over the limit but when I signed up with MTN I made sure to set my limit at R220 and I still got billed R282.86 this is after I spoke to the adviser in store and he reassured me that the matter will be rectified and I have discovered that nothing has been done about it. I need someone to get back to me today still! NOT IN 7 DAYS TIME!!! I have emailed customer care my invoice, all my details are on there so I am sure they can make use of that information to have this matter resolved.