Hey there @TJ51, thank you for getting in touch. It sounds like you had already met the minimum payment if it was showing as zero. As long as you paid more than £25 or 1% of your balance, whichever is greater, firstly then you’ll have covered the minimum payment, as long as no additional charges were on your statement.
If you’d like to discuss this further, can you please message @Anonymous your full name, DOB and postcode? - Cheryl