How to keep my line active as I am in Europe

Please I'm trying to unbar my line and I was asked when it was activated and the last airtime I recharged which I have forgotten please help me here is the number 08031128141

I need to activate CUG on my line

I need to get a mtn cug activation code for my line 09068876266

Someone is using his/her MTN line to dupe people.