Landlord returned my deposit in full, stated I’d get the full amount in an email, landlord now saying it was an error? What can I do?

I left a six month tenancy early so in my contract it states, the landlord would deduct fees for advertising the flat etc which is fine. Landlord was four days late in sending me the end of contract letter. They also returned my full deposit which was surprise. They even send in an email, they have returned the full amount and there’s a statement file they shared to confirm this. Landlord calls an hour later saying it’s a mistake and that they forgot to deduct the fees off before returning my money.

I am suspicious as I do not understand how they could return it, state they have returned the full amount and they even created a statement of a breakdown of all the rent and deposit I’ve sent to them and the money they returned to me. How can you get that wrong? What should I do? They sent me an invoice of deductions saying I have to pay today which is also unfair because they were four days late in returning my money yet I’m expected to pay them back asap when they’ve messed it up? They did all of this at the end of the day so any chance of getting legal advice today isn’t possible as all offices are shut

Landlord returned my deposit in full, stated I’d get the full amount in an email, landlord now saying it was an error? What can I do?
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