Complaint Letter: Disconnection Despite Payment Made on Time

To Whom It May Concern,

I have paid my telephone bill for [insert Month] of [insert Amount] on time and my phone was still disconnected by your company. I am very disappointed with your service.

I have been a good customer of yours over the last two years, but this last instance has prompted me to take action. As you can imagine in a small family-owned business, every client counts and losing my phone service has cost me to lose a number of orders. Your company's actions has drastically affected my business.

I hope your company would take appropriate measures to reduce or prevent the possibility of another situation occurring in the future.

Attached is my billing statement for your reference.

Your immediate response is needed.

Regards,
Mr. S