2 weeks contract still not activated

I've been trying for 2 weeks now to get an MTN contract activated. They say my credit limit states R0 on the system which is why they cannot activate my contract. I have never missed a payment in my life which is why I cannot understand this after they have vetted me. According to the NCA, I am entitled to a reason, but they cannot give me a reason. I have also been an mtn contract customer for 5 years+, but they cannot help me. Please guys, it's a R39 a month contract, just activate it already or give me a reason why you can't. If you cannot, at least give me a person where I can escalate this to.