Bought a used 2015 GMC Yukon right around a year a...

Bought a used 2015 GMC Yukon right around a year ago. Was told it was serviced there regularly and now after putting 20k miles on it I m putting a new transmission in it because it is totally shot at 122k miles. NOT HAPPY AT ALL think I ll leave a bad review for every dollar it s going to cost me as well