Nor receiving non-MTN calls

My number has been barred from receiving calls. Last week Tuesday it notified people that my number doesn’t exist. I then went to an MTN branch for assistance and was informed that it may be a network issue with other providers, and that the issue would be resolved soon. Since Thursday my phone now goes to voicemail whenever other network try to call me. Fix it, you’re impacting my business for a second week now.