VFS South Africa - Incorrect appointment times

On pre-payment page, they suggest certain dates are available and ask you to pay to confirm (you can't actually see the calendar unless you pay).

Upon payment, previously suggested dates are not even close to being available. They basically lure you to pay and then you get stuck because you can't really get a refund?

What am I supposed to do now if I can't make the dates in the future at all.

Why suggest dates at all if they are not available?

Why not show the calendar on the payment page so customers can decide if they want to pay or not.