i recharged my data and could not use it because vodacom had network problems nationally

I recharged my data but vodacom had network problems nationally. Then when network was back i checked ballance there was 0 balance. I phoned vodacom and i was told i used the data. I ask how possible could i use it if there was no network. The lady shouted and repeated that i wont get refund i used my data. She claimed that she will escalate my query to technicians its the second week now no call received. Further more they retrieve all my sms so i cant see them. Since then i get sms notification but nothing in my inbox. This tell me there is something to hide.

Please return my data