Introduction

• We are sorry to bother you about the following problem.

• Since no action has yet been undertaken with regard to …, I would ask you to …

Further details

• In view of this discrepancy, I request you to …

• We will expect you to replace the goods before …

• Would you please look into this problem and advise us of your decision.

• Immediate action seems called for.

• We suggest that you remedy this problem before …

• I suggest that you act accordingly.