Why did my mtn number stopped working

I did a welcome back

My sim card is currently damaged but I do not want to loose my number, so I recharge it every month. Is this enough to stop the number from being deactivated?

I brought a 12gb data plan to a wrong MTN number can I transfer back to another MTN number

I have been roaming my MTN sim since I entered UK two years ago, all of a sudden I lost the network. Why and how do I get it back, please?