Vodacom - charging clients for an error they made

November 2014 I verbally agreed to receive a \Special"from Vodacom (Tablet with 500MB data for R99). I was told the money would only be deducted off my account once I opened the package and used the product. When I received the package I realized I had misheard the person selling it and it wasn't what I wanted. I tried to return it to the Vodacom shop and they told me a courier HAS to fetch it (4th December was first day I called Vodacom being promised it would take 7-10 working days for them to fetch). I called regularly to the after-sales contact centre asking they fetch the product. I also had money deducted from my account for the product I didn't want and had not used!! I continually called all of December and was promised the courier would fetch it before 31st December. They didn't. More money was deducted from my account Jan 1st and so I called my bank and reversed the funds back into my account. Since then every day Vodacom has sms'd or called to tell me I owe them money. I queried the additional R60 they originally said I owed"