MTN-Supersonic Poor service delivery

Poor service delivery from MTN-Supersonic, I have no internet connection for almost 3 weeks, my account is up to date, and when I try to log my query via their website or email they don’t respond, even tried calling their customer care helpline but no answer, Their whatsapp is also not working.I have never had such a poor service delivery . I am cancelling my subscription and try something else. I’m so disappointed.