Any suggestions on how to revise my message?

Any suggestions on how to revise my message?

Dear TechStar Computing:

I’m writing to you because of my disappointment with my new multimedia PC display. The display part works all right, but the audio volume is set too high and the volume knob doesn’t turn it down. It’s driving us crazy. The volume knob doesn’t seem to be connected to anything but simply spins around. I can’t believe you would put out a product like this without testing it first.

I depend on my computer to run my small business and want to know what you are going to do about it. This reminds me of every time I buy electronic equipment from what seems like any company. Something is always wrong. I thought quality was supposed to be important, but I guess not.

Anyway, I need this fixed right away. Please tell me what you want me to do.