MTN *****ing my airtime and data

Good day!<br> <br> I have an iPhone with top-up contract. For the past 2 months whenever i receive my monthly allocated airtime and data, it is completedly depleted within 3 days. I do not make any phone calls and use data mainly for whatsapp. I then loaded R30 airtime and made a 2 min call to a cell c number and 1 hour later, all my airtime has disappeared. That is totally pathetic!! Whenever I call the store they say they will log it with the call centre and nothing happens. I follow up a week later and they inform me they are still waiting for a response from the call centre. I visited a store and the consultant checks to see if my apps are using all my data(which doesnt explain how my airtime disappears). When i call the call centre directly, I get an automated response that they are on strike. How can the company function with being on a 2 month strike??? I cannot make calls, cannot use the internet and get no customer service. I DO NOT HAVE ANY SUBSCRIPTIONS ON MY NUMBER AND MY APPS HAVE BEEN DISABLED FROM USING DATA! MTN is the worse network in SA with useless staff and no sense of urgency or importance