Unless they have unfair contract terms, or are accepted under duress, or don't make terms/changes visible enough (e.g a tiny wording change written in 8 point i

Unless they have unfair contract terms, or are accepted under duress, or don't make terms/changes visible enough (e.g a tiny wording change written in 8 point in the middle of a 20 page contract may be unenforceable) etc - at least in the UK.