Useless service. Barred SIM. Constant subscription messages

MTN is so USELESS. I'm always bombarded by messages like "you have already subscribed to this" and "thank you for your subscription" as if someone is using my phone to subscribe to different things. These messages come randomly and no consultant knows how to stop them or why they keep coming.

This morning they decided to RICA bar my SIM card. No one can tell me why either.. I'm so fed up with MTN. Even data that normally lasts me 10 days with MTN it's only one or two.