gramma & re-write

1)每個月我要定期為自己跟開customer account,去追客過期未找既payment.
Each month, I have to follow the custmers' accounts to chase the overdue payments from our trade debtors.
2)For each quotation request, (a/the???) customer will send us technical data,...
For each quotation request, the customer will send us technical data,...

1) I am responsible for collecting unsettled account receivables of my customers monthly

2) THE