Myers doesn't acccept cash, page-9

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They provide the links.

That's a contract.

The trouble I have is that I was offered the suit at a price and I agreed to that offer.

It was an acceptance.

Then they changed the rule book and I suspect it's only for Myer's own self interests.

Sure. You could say, so what, this is life and yes, I agree. All for it, but, and it's a big but ...

... the conditions of sale need to publically be known by both parties, before a legal contract is entered into.

It's a big error by a very well known corporation.