MultiChoice dstv

Hi, on the 27th of March i made a payment via banking app for dstv, they have sent me an sms saying i must pay R299 on my account, and i paid R300, normally i also check on their whatsaap contact to check hw much do i owe to make a payment, it was also saying amount due is R299 for the 27th of March, i paid it, unfortunately it didn't reflect on their side, i them made means to email them my proof of payment, i chatted with da consultant they reconnected it, then after few days i got disconnected again, i then chatted with the consultant, and now they are telling me i need to pay extra cash for arrears and reconnection fee, which is unfair because on the proof of payment the date shows that i have paid on time, this is not the 1st time they are doing this, and it is frustrating.