Incorrect MTN number and repugnant SMSes

Greetings

1. When I call *** MTN reports that the number is incorrect. The number is on the mtn.com website under "Contact us"

2. I am received a SMS from MTN for EasyBet with a short URL of bit.ly/MTN-AWB. There is not cell number that I can use to block these messages. Why is MTN allowing this service provider to send messages to me? I find gambling immoral and against my principles.

Please inform me how I can block the sender on my iPhone.

Regards