Stock error - replacement withdrawn

Pair of metcon trainers on sale on their site and it has 1 more of my size UK 11. I decide to buy the pair and pay immediately , only to get a call from them that there is actually no stock a few minutes later. They do however have another color and willing to ship that instead, I agree however this was not my 1st choice.

3 hours later got a call to say they now picked up there is a price difference and they cannot ship the replacement item anymore as promised earlier.

I would have expect if they offer a replacement (only a few hours earlier) they will stick to their word and ship it.

Now awaiting a refund, hoping this will be solved soon to spend my money somewhere else