Double charges! Taking chances with me!!!

This month I purchased 2 x voice "airtime" @ R50 each for my VOIP services. There was no way I could have this added on my bill and payment had to be made on checkout, which I did via credit card. The next day I get whatsapp and email with the R50 invoice which they require payment or it will be debited off my account. Upon querying this with home-connect for the 1st purchase, I had to explain in detail to the consultant how their checkout works. She then acknowledged this payment and would request a credit. (DID NOT RECEIVE FEEDBACK SINCE). Today I get the same invoice for my second purchase. I am now tired of calling them, I am waiting for my account to be debited, then I will hand them over to my attorneys. BEWARE OF HOME-CONNECT online purchases.