I already use Yotpo which sort of does that for me.
Reach out to these people individually, and ask them yourself using real human words. The good reviews is worth your time.
People don't have time for Yotpo or automated surveys, they will MAKE time for real people.
A short example in the power of polite copy/positioning: I did an @reply twitter campaign which basically spammed my kickstarter to people. I did two versions of my tweet copy:
- "Since you backed exploding kittens, you'll LOVE this game: LINK."
- "Would you please consider taking a look at my kickstarter? LINK."
Tweet #2 had people saying "Of course! It looks great, thanks!"
10% of my funding came from the direct tweets to message #2.
Don't underestimate the power of real human contact, being nice, and being a real person.
I went from basically "F*ck you" to "thank you" by rewording my copy from being super automated to at least LOOKING natural.
some people give a one star if a cable doesn't work (an accessory that comes with the main phone we sell), instead of emailing us for a free replacement.
Nobody wants to wait for a free replacement. Hell, even if I got the free replacement I'd still leave a 1 star review for my inconvenience. I don't want to wait MORE time to use the things I already bought. I expect to get what I pay for without having to complain via email about it.
Is testing your components by hand viable? Batching out quality assurance and making sure they're not getting duds will eliminate the problem altogether.
Also, most customers don't take the time to do that. Remember they are bombarded with surveys etc daily so they probably ask "what's in it for me?"
"Probably" is wrong. They don't ask that question unless you teach them to ask it.
Putting a $ value on leaving a review trains them not to help you unless you give them something.
Coupons and discounts in general train them not to buy from you unless they're getting a discount.
It's an all-around bad direction to travel and you'd be setting up negative reinforcement for their future dealings with you.