My client has been using Money Manager to file VAT returns under MTD. When preparing the accounts I usually send details of the errors made in the year and the client adjusts the totals on the next return. This year the client is unable to adjust the figures - usually they deduct the overclaimed vat from the totals but this year the computer says no. The support line is constantly engaged. The help pages state that amendments to a filed return can only be made through the HMRC website. The figures are low - well below £10,000. Any ideas ?