We've been disconnected 5x in 1 month

Account ***, E Mogami, ID number *** 084. We paid our account on the 28/01/2015 with transaction number (ref) *** (R185). On 2nd feb we were disconnected, called the call centre emailed proof of payment and after 6 calls was reconnected, it happened again 2 days later and we had to the same as above, a week later we were once again disconnected, and every few days thereafter. this is time consuming and a waste of time as this morning we were discinnected again. how many times should we call the call centre to rectify something that should have been rectified from the first instance. Very bad service