Worst company ever, replaced a 20$ part for 500$ a...

Worst company ever, replaced a 20$ part for 500$ and it caused my unit to fail, then when I asked for my money back they said "we can credit you if you let us replace the unit" I just wanted another company to do the work due to their dishonesty. I would not recommend this company. I guess the money back guaranty is worthless, shouldn't advertise it, if you can't back it up.