Umable to claim reminder of tax reefund

Hello all, I've filled my tax return and was able to claim tax refund on it. I wasn't allowed to claim all of it at once. What I've got now that my balance shows as 570.20, but when press ''claim tax refund'' button, on the '' Request payment'' pages It shows -275.00 Do I need to call HMRC and wait for hours to sort it or is it any other way around? There should be around 700£ available to claim.

Hi
If the amount is not showing as you expected contact our Self Assessment department either by telephone or by clicking 'Ask HMRC Online' and requesting to speak to an adviser.
This will put you in the queue for webchat.
Self Assessment: general enquiries