Asking for payment a of Bill
We sent you last week our bill for groceries supplied to you in the month of April.
Kindly take the trouble to expedite it at an early date.
Reply to above
Dear Mr. Suresh Lai,
Thanks for your letter dated _____ I regret my inability to settle your bill this month due to unavoidable circumstances. However I shall settle both the bills in June.
Hoping that you would not mind it,
Yours Faithfully .