your written off car from the other, at fault, party's insurer, or 7 days after they say they issued it?

My broker, Swinton, is saying the former, but the other insurer is not only saying the latter, but that they refuse to pay the hire charges longer than 7 days of the issuing of the cheque, not my receipt of the cheque

Don't answer to tell me to look at my policy, only answer if you already know!