I thought they were helpful?

A sales consultant called and asked if I wanted to increase my minutes/data/text as I seem to buy more each month, what an amazing service and for only R30 extra per month. For once I was glad I answered a sales call. This month I'm billed for the original contract + the R30 + my headset value (which was included in my original contract) so I'm now over by nearly R300. Call the call centre this morning to sort it and spent nearly 40min on hold for someone to answer who didn't understand/can't help/can he provide other phone numbers (I was told to call cancellations to sort it out?) What a waste of time - I need someone to call me back who can resolve the query and provide a refund as the sales person clearly **** in order to secure the deal.