Extremely annoyed to find that I was charged another €10 for a data add-on that I spent almost an hour trying to cancel two weeks ago. I that that I had eventually figured out that the cancelation had been adding to my "shopping basket", and that I had to "complete the transaction" to remove the data add-on. But apparently, you have to do that twice to actually make it stick!!!!
Cancelling a data add-on should be just as easy as acquiring it in the 1st place, and if you use the 10NET short code to add a data add-on, you should be provided with an equivalent short-code to cancel that, rather than having to jump through undocumented hoops on the website to turn it off again.