CELL C STILL NO ANSWERS

I have written a previous complaint that still hasn't been resolved. I have been trying to resolve an issue on my account since 7 APRIL 2015. I HAVE LOGGED CALLS & FOR WEEKS WAS IGNORED. Then eventually Someone has contracted me but NOTHING HAS BEEN DONE AFTER THAT. I received an email to say my account will be credited AND NOTHING HAS BEEN CREDITED. I have written 3 EMAILS to 'Moses Mo***eng' querying the billing and data usage with no responses. I am running out of patience.... IF CELL C CANT PROVIDE A SERVICE AS SIMPLE AS REPLYING TO A QUERY THEN THEY SHOULD NOT BE IN BUSINESS!! CELLC NEEDS TO HIRE PROBLEM SOLVERS AS ALL THEY DO IS PASS ON THE PROBELM TO THE NEXT PERSON!!