Donnie installed a new garage door opener for me o...

Donnie installed a new garage door opener for me on 9/25/17. As I write this on 10/18/17 the opener and the door have been working great! The door is even quieter than before. I am pleased with the responsiveness and the quality of installation.
I am not pleased that I just noticed the T&C's on the back of my invoice that were not pointed out when I was asked to sign it. It says the tech has shown me how to adjust my safety sensor eyes & the up and down force of my operator. It also says that this invoice must be presented for warranty work & that I have received my warranty/repair sticker. None of this is true. The only sticker I received, I found stuck to my garage wall after Donnie left - I didn't appreciate that at all. Be sure to check your paperwork before the tech leaves.