Extremely Poor after sakes service MTN

I recently signed up for a home home premium 5g 35 mbps package with a 500 GB FUP. I realized that this would not be enough and then attempted to call in to the MTN call centre to change my speed and upgrade to the 800 GB FUP package. My experience was nothing short of diabolical, waited for long periods going through their automated customer protocols which was tedious and eventually placed on hold because they seem to have high call volumes all the time, only to be cut off. I did eventually get through this morning and the agent indicated that I needed to cancel my existing package and sign up for a new one, wow , so much for just upgrading and meant that I had to redo upfront payments and possibly be withought service while MTN resends me new modem despite me recieving a new one last month. The agent then just cut me off because I questioned why this would be the case. Stay away for these guys, really poor back up customer service