New contract/client

On the 7th March 2026, I imported my number from a different service provider and went over to MTN ,took a new contract and everything (but kept my excisting number), since then I can't receive any in comming call, or make out going calls, and when I'm away from wifi, my phone does not have service it's keep saying emergency calls only? As of today (17 March 2026) I have the contract for 11 days, and MTN can not seem to sort out my problem. I spoke to MTN customer service yesterday (16 March 2026), they transferred me to the billing department. Can someone with more experience from MTN maybe phone me to sort this problem out?