My MTN line is not working for some days now please any solution 0?

My mtn line stopped working for sometime now and I tried getting network but was impossible and realised someone else has the number...

My mtn line is no longer working in UK, no network coverage at all and it wasn't like this before but this change few months...

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My MTN line have not really been working for some day now, the bars signifying network is always there on my phone but I can't check balance or do anything ussd. I can't call...