Firstlt ring them up and ask them to send you a statement of the loan and payments in full. This way you will see if there were letter and
phone call charges added as well. You might also find a few unfair penalty charges, all of which you can claim back.
The
interest on a welcome loan goes on every 19th of the month. if you can make the payment before this date, the
interest is lower, than if you paid after this date. So if you missed a few months, the
interest would climb, as it is compound.
Ask them for a statement first and then you can have proof of everything then
Sinead