WORST Customer Service, Billing Issues, Rude Staff

I have had the WORST experience with MTN. I only ordered my MTN router a month ago, it arrived 2 weeks late, I have been overcharged already, and the customer service is an absolute joke. I've called and had a woman hang up on me when she can't answer questions, I've emailed in and had no response. To top it off, if I get through to someone, they usually can't help as their system is down or their laptop won't load. The MTN App is useless and slow - you can't find any documentation, and I still have not received my contract for the service. I've never written a negative review before, but hugely frustrated with this company. They're quick to act when you sign up and make payments, but you can't get any help when they overcharge or make mistakes.