I can't access internet despite calling in 4 times

So I have been experiencing a problem with MTN, I couldn't check my airtime balance. I called in today to explain my issue, firstly when I call the customer care line there is no option of speaking to an agent, you have to press other options to speak to one.

I called pressed option 5, spoke to a lady by the name of Mesuli jonga she said I must switch my phone off for 10 min to refresh my sim, I did so still I couldnt access my internet and WhatsApp, I called in again spoke to guy by the name Onam Mbane he said I should switch off my phone for 10 min, I did exactly that i still couldn't access the internet. I called on again spoke to another lady who said I should not switch off my phone but instead switch my mobile data off and put my phone on flight mode, I still experienced the same problem of not being able to access internet and whatsapp. I called again spoke to this other lady who at first was polite and after she became rude because I couldn't understand what she was saying, she ended up hanging up. I don't know if that's how MTN agent treat their customers by being rude.

I'm a client I expect to be given respect at all times. I am still experiencing the very same problem where I can't access internet and WhatsApp basically whatever uses mobile data I can't access it. Kindly assist.