MTN constant harassment and ********* changes

About two months ago they advised my package had been discontinued. They would replace with the closest match and aligning the payment. This was done. Not a week later and they send threatening mails that discounts would be removed. Even got a phone call saying I am paying R233 - no was paying more indicating there were no discounts or they were ripping me off. I warned that if they did not stop harassing I would port my number. Well that month I got another message saying I had exceeded my limit. As I had set it that no excess was allowed I thought it was my work line. They advised it was not so I queried MTN, they had removed the capping but I had to pay for their mistake. This month my bill has increased to R473 no notification. No message to say the statement is available - they cannot even send an e-mail statement and can’t even get my address right. This bunch are the pits and after more than 25 years I am done. It is time to get rid of them and go to a provider that does things correctly. I will also take to the Consumer or Public Protector. They have some explaining to do