I have a APC UPS that I use at home.
Two weeks ago, I called their customer service center to report that my UPS was dead. [After a 20 minute wait to get the agent.]

They took in my complaint, and promised to fix it in 2 working days (at the most). I even volunteered to go to their office and get it repaired. They stated it's not necessary.

3 working days went by, nothing happened. One more follow up call after waiting for 20 minutes, and another promise that before end of day it will be done.

Call #3 a day later, and still nothing happens.

Call#4 (now a week later), and I find that (thanks to the customer support exec) the ticket is not actioned at all.
He promised to escalate it; and I try to get the GM's email id.

In such a co., I was lucky to get the email id for customer feedback.
A stinker of a message, followed by a computerized response stating that they will revert back.
Surprise, surprise I get a message stating that they will act on it and close it in 2 days.
They call me on the appointed day and apologise that they are out of stock and will fix it in 3 more days.
Two more days have gone by, and there's still no sign.

It's on principles that I fight. The time I have spent on this would not be worth the value of the fix they are going to provide.

It just goes to show how they take customers for a ride (with a series of lies) and most importantly a new definition for UPS - Uninterrupted Promises Supplied.