Whether you are owed any wages would very much depend on what period the pay covered. The pay slips may say it is for period 26-25th but in reality they could be for another period. You may have to go back to the beginning of your employment with them to determine what you have actually been paid for and what period the pay slips actually covered.
If you had any holidays owing these should have been paid with your last pay as well, even if you did not manage to take them before you left.
The non-payment of wages or holidays amount to an unlawful deduction of wages. In order to try and resolve this, the employer should be contacted in writing, advised that this is being treated as unlawful deduction of wages and ask them to pay back the money within 7 days. Advise them that if they fail to pay the money that is owed, legal proceedings could follow.
If the employer does not return the money as requested, a claim can be made in the employment tribunal - the time limit to claim is only 3 months from the date the deductions were made. To make the claim, form ET1 needs to be completed and submitted - you can find it here: https://www.employmenttribunals.service.gov.uk/employment-tribunals
Hopefully by warning the employer you are aware of your rights and are not going to hesitate taking further action they will be prompted to reconsider their position and work towards resolving this.
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