Tui asking for more money

[Strictly1]

I moved my deposit from this year to next year. I did change the destination and chose a holiday costing more, however, the summary page said deposit paid next payment due May 2021. They've contacted me asking for more deposit. I've disputed this and said I won't pay - cancel it then. They're refusing to cancel without additional payment stating it said on page four that more money was due. Is there anything I can do?

Did you pay on your credit card? Maybe look into charge back?

If you only paid a small deposit ( I think it is £75 per person) then you have to pay the balance of the deposit which I think is £200 per person within a certain time then the full balance 12 weeks before departure .
We moved our Tui holiday and that was the procedure .

I've moved the holiday now. But no, I paid £600 and they wanted a further £150.

If you do pay it, pay by credit card for added protection. Have you got insurance in place?

Not yet but will

I think the timing of insurance is important to cover this - it possibly should have been in place before booking. Not an expert, so check the policy. For example, if you pay more but can't go next year, or travel advice is ambiguous.