Increased rent through email but no new contract

Hi, I increased rent by just £25 last October, after agreement by tenants but the contract was not changed so I have now got a £300 credit in favour of the tenants which OPENRENT said I should reduce back to zero…but how please? A new contract is about to be signed…(sorry a newbie, I messed up!) but I need to reduce credit back to zero please. Tenants are great about it and understand my mistake.
Grateful thanks,

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