Dishonest online upgrade

On Fri 10 Dec I was contacted by an online upgrades sales consultant. He offered me double the minutes on my contract for the same price I am currently paying which he said is R99. Who could say no to that right? So I accepted. When looking into my account I discovered that in fact I was only paying R71.99. So he had been dishonest with me. When calling to enquire I was then told that the amount would actually end up being around R115!! I am horrified at the dishonest behaviour and have cancelled my upgrade. So let’s see whether they can be honest enough now to honour this request!! If not, then after over 20 yrs of being with them I will definitely be considering moving over to another provider!