and what exactly does he do for a living

cute

My phone was stolen and the culprit was using my line to load credit worth thousands of Naira. so I went to my bank and change the line and a couple of days later I started receiving alert on it. I thought everything was fine not until I loaded money on it and I started seeing debit alert of credit purchase on the new line that the former number am using is still loading credit from the bank. I was dumbstruck. is there any logical explanation for this? I am thinking of taking legal actions against them or what do you people think?