Wrong contract plan

On 26 March went to do an upgrade for my data contract with Vodacom. I was assisted by Anthea at Voda shop in Haward Centre Pinelands who I said that I want the same plan that I was on she did the upgrade. To my surprise on the 31 march my data and airtime depleted. I called Vodacom call centre I was told that I’m on Open Line contract which is not what I was on before. They said they can’t change back to Top up it can only be done at store. I went to the store again to enquire about this. Anthea said she will request for reversal then she called me the next day and said it’s done. On Friday when I wanted to load airtime I couldn’t, and I check with call centre as to why I was told I’m still on Open Line. Friday 5 April went back to the store to find out what is going on I was told by Anthea that they can only reverse the contract not the plan while she is the one at wrong. She called Colleen Wilson who was not answering the phone. I left as I had to go somewhere, and she said she will call me to give feedback, but no feedback was given to me until I called on Monday the 8 April. Then she said she will send an email to Colleen asking her to give me call that also never happened. I went to the shop again on Tuesday the 9 April I asked to speak to the manager who she introduced herself as Naiema, she also said it cannot be reversed to Top up plan. She was shocked that Colleen didn’t call me she sent her an email. She advised me to get use another phone, buy new SIM card, and load airtime on it, I informed that I don’t have another phone and I will not get another sim card as she can even give me minutes because the system doesn’t allow her to do so. I left the shop without any solution to the problem and the inconvenience the caused. Within two minutes Colleen Wilson called with +27 (82) *** number telling me that what is wrong with my phone that I cannot insert another card. I told her that she cannot tell me what to do in my phone for their mistake. Colleen Wilson said the mistake they did cannot be reversed. Went back to the store I told Naiema that Colleen Wilson has no right to speak to me like that. All I want is the Top up plan and be able to load airtime. Naiema gave me R100 credit in my account but still my query hasn’t been resolved. My query hasn't been resolved I cannot load airtime now I can't call my parents and my child.