Network issues

I have been experiencing network issues <br> with my current sim card since last night.I have been using this sim card <br> since 2009 and all of a sudden it stopped working.i called CELLC and I was <br> advised that my number has been registered as a contract sim card with your company<br> . I had a contract with Nashua mobile about 9 years ago but my sim card has always been a prepaid sim card and I have also loaded airtime <br> of about R100.00 on this sim card.Am I going to lose it or will I be able to <br> get it back seeing as I cant do a sim swap on this number??? I just want to know WHY is my sim card registered Nashua mobile<br>