Cell C
Poor service and passing the buck

I had a cell c no. for years, i took a contact with nashua mobile and when it came to an end, my cell c no. was on perpaid with cell c. Now my cell c no. has no network cover. When i go to a cell c store, they refer me to nashua mobile and nashua mobile refer me to cell c, CELL C has no SERVICE AND ARE PASSING THE BUCK!!! I would like to take a new contact with CELL C AND KEPT MY ORIGINAL CELL C NO.
PLEASE MAY I GET SOME HELP!!!