Reconnect my service

Another appalling customer service from multi choice agents. Shockingly rude. My husband paid R700 yesterday when our monthly service is R636, the service was terminated and when we inquired, the first agent on whatsapp said we had to pay R500 and some odds, then again on the same whatsapp, bot response says R383.04. I called their customer service line, the rude girl I was speaking to said it it a reversal from July, but July we paid cash, so how is it a reversal? There was a month that we never paid the service and we didn’t have the service for a month then we paid on the 28th July and had our service reconnected. When I ask how is this a reversal, she asked me why am I asking her? I’m fuming because we paid more then what we should’ve paid, now they ******** us saying we have to pay because there is a reversal, reversal how? When a payment method is cash and not debit order? Fix this now. Because this is not a contract where you’d be in arrears.