Missing Airtime

Vodacom has been good for many years but they are now going down hill at a fast rate. My airtime is dissapearing and my sister has the same problem. I have sent an e-mail to customer care but no response. She got an response and said she was subscribed to vlive and must send sms STOP ALL to 31050 and that did not work. I have already moved my data to another service provider due to data going missing and if Vodacom dont fix this airtime issue ill move over to another service provider completely. People be aware of your airtime going missing for unknown reasons.