[heero_yuy]

Once the services are suspended it's my experience that you have to settle the full outstanding amount. If they roll over a second month's bill whilst your services are suspended you'll only need to settle the original overdue bill. Not the notional additional bill(s).

Once the original bill is cleared then they will credit you for unsupplied services off the next bill.

Best to always pay up in full before the date of the next month's bill. You can stretch it to the day before they make up the next bill rather than the pay by date at the top of your bill, usually without penalty.