The payments made will be offset against the weekly charges [ie the charges will be reduced by the sum paid in that week] and after that against any arrears in the weekly charges.
I think the second sentence is saying that any excess will be deposited in a Premium Charge Account [presumably at the Bank], and after that within an account designed to pay for any Court Costs outstanding.
What is the bit I have highlighted? It makes no sense - are you translating this agreement from Dutch?
- For Teachers