Air time issue

On Thursday 31st March 2016 my issue started was using my phone as per normal then all of a sudden my Wats app messaged stopped going through. My airtime was at a zero balance but I still had data. On Friday morning I recharged with R20 and for 2 hours everything was working fine , at 12:00 Friday afternoon my airtime was used but I still had data. Agent confirmed that Vodacom was taking from my airtime and not my data. Two cases' was logged for this investigation and they advised that I should switch off my data connection and not to recharge .On Sunday morning I was contacted and informed that they could not find any issue but I was credited with 500MB data and airtime . I then contacted Vodacom on Monday , Tuesday and Wednesday but nobody can assist me , I am still experiencing the same issue where I can't connect to anything using my phone. When I am in a wifi zone my phone works fins but when I need to use my data my phone don't work. I was told it could be the phone I was using (Prolinephone SP4- windows OS) I then inserted my card back into my lumia (720) but the issue still persist below are the reference numbers logged : A2_1N36_3AV2CZ - Friday A2_1N3Q_01C2YW - 2nd Apri