unhappy customer

Dear vodacom

I'm an unhappy customer ever since I upgraded my contract in November 2018, which I have had for years with you. I have not had any joy from renewing my contract at your Maponya mall store, where the consultant there put me on on open plan contract when I had specifically told her I wanted a top up plan. Then in May when I still had problems with the router and went into your Fourways mall store, the consultant there messed things up even more by putting my contract which was for 299 price plan to R650 price plan. I have been paying the R650 without complaining after being inconvenienced by the *********** people you have in your stores and call center. Last month I received an invoice that says I owe you R1549, which I went into your Fourways mall store to query, only to be referred to the accounts department. The consultant I spoke to hung up on me and everytime we tried calling back they hung up when the supervisor in the store mentioned he was calling from Fourways mall. We called customer service and still no assistance was provided there as the call got cut off. My wifi service has been disabled at home, without a proper explanation. I have paid this account every month on time. CAN SOMEONE PLEASE EXPLAIN WHY I AM BEING TREATED SO UNFAIRLY.