Losing data....My second complaint within 24hours...different device

Last night I posted my complaint on Hello Peter. Vodacom data depleted in a few days ! Another device lost data ....also last night. I spent 50 min with Vodacom tonight just to get a reference number. They told me that all the customers at Vodacom is happy and that the global lost of data happened only last week....they accused me for not managing my data. My husband received a sms from Vodacom tonight and it confirmed that 1GB was activated, within a minute he received another sms confirming that it was depleted. In total we have now 3 devices so far with depleted date within a flash ! What is going on with Vodacom ???? We make little use of our phones and already asked assistance at the Vodacom shop. If I top it up for connection, it will only be lost again ! Very sad to say, but we cannot be the only unhappy customers. Vodacom claims that the rest of their customers are HAPPY ? How will we ever get our data back ? How will we be refunded ? How can we cancel our contract without paying fees for early termination????? We will have no choice but to go to another service provider after years of supporting Vodacom !!!!!