Untested assumptions

I was buying data using the *135# interface this morning. I selected option 2 for buy then option 2 for data then option 4 for 7 or 14 days. Then option 1 for once off.

Then I selected option 4 for 1 Gig of seven days instead of option 5 for next.

The next screen informed me that I had just bought one gig for seven days without an option to confirm. I then received an sms informing me that I indeed had bought one gig for seven days.

I called customer care and spoke to Nqobile who informed me that the system always requires confirmation before processing the sale and deducting airtime.

I protested because I have previously and many times bought data the same way without any need to confirm. She then went to her supervisor, named Sheila, who told her the same thing that the system does not deduct the airtime without the confirmation.

She returned and again told me that the system requests confirmation and that I should take my phone to a store as it might be an issue with the phone.

Again, I protested as I have been using the functionality without need for confirmation for as long as I could remember. Even when I buy the 2 gig for fourteen days or 1 gig for fourteen days there is no need for confirmation. And even with other people's phones and numbers there is no request for confirmation. Even with my previous phone.

All I want is to reverse the transaction so that I can buy the 1 gig for fourteen days. Why am I being told about confirmation when I am telling them that I received no such request for confirmation?

Do these people even use the system before telling me how it is supposed to work?