I have an issue with my other MTN line

Please help me block my husband's MTN line number 07069350323. His phones were stolen some hours ago. Thanks

I cant call out and I can't browse with my mtn line since yesterday. Its saying my line is barred I dont have services. Pls kindly help me to resolve this. It's my business line

My phone was stolen this morning and I would like to block my mtn line

What can I do