NO SATISFACTION AT CALL CENTRE

HI,<br> <br> I NEED TO CHANGE MY EXISTING CELL NUMBER FROM PREPAID TO CONTRACT. I WAS ASKED AT THE MTN STORE TO CALL 808 AND ASK FOR RETENTIONS AS THEY HANDLE THIS. I HAVE BEEN TRYING TO GET THROUGH TO THIS NUMBER FOR ALMOST A MONTH WITHOUT SUCCESS. THE VOICE ON THE OTHER SIDE CONTINUOUSLY SCREAMS OUT THAT THEY ARE EXPERIENCING HIGH CALL VOLUMES WHILE YOU WAIT FOR MINUTES ON END. I HAVE MADE OVER TEN CALLS TO THE 808 NUMBER. PLEASE CAN SOMEONE ASSIST ME IN THIS MATTER.