Airtime *******.

I landed back in SA this morning and rushed to MTN to buy a sim card and data ect. I looked at the prices and was shocked. In the UK 5 gigs costs £8 and no charge for air time . It is included. The to my consternation I was told that what is not used in 30 days is lost . Is that not theft. It would be like paying for electricty and it only be valid for 30 days. So what you don't use is ******. Not right Maybe MTN and company can answer bearing in mind the same should be valid in the UK as well.