Paid my account at Wonderpark & its not reflecting

I paid R250 into Account number: QO271718 /*** on the 2nd of March 2016 and this morning my data bundles [MyGig 5 Promo@R259 24M TopUp] was cut. I called 5 times and i was told that im in arrears and Vodacom needs proof of payment. I went to the Vodashop to have my slip reprinted and a guy called Lesley offered to help but he is now not picking up my calls. I am not in arrears cos i paid R300 last month. What should i do in this instance? I don't have a slip with me. I'm running a business and its has completely stalled.