POOR SERVICE

I HAVE HAD A CONTRACT WITH MTN FOR AS LONG AS I CAN REMEMBER. RECENTLY DUE TO THEIR UPGRADE OR WHATEVER THEY CALL IT TO THE ACCOUNTING SYSTEM, I AM UNABLE TO RECHARGE ON MY ACCOUNT. TO DATE THEY HAVE NOT RESOLVED THE ISSUE. NOBODY SENIOR ABLE TO TALK TO YOU NOR DO THEY RETURN CALLS.... TIME TO MOVE