Data

I purchased data via my mobile phone last week Friday. <br> There was an error buying 10 Gig. I waited a few minutes and then decided to try buy data again. This time 20 Gig. 30 minutes later I received notification that I bought 10 and 20 gig. I phoned the call centre and theysaid they will sort it out and get back to me in 24 hours.<br> <br> Now I see my bill and I have been charged for both the 10 and 20 gig. <br> <br> I want this solved ASAP!