I purchased a pair of headlights for my truck. I i...

I purchased a pair of headlights for my truck. I installed them and while adjusting them one broke at a mounting point.
I went on line to return it and I did not know if I had to return 1 or both. I was inputting the info and hit a wrong key and the computer said part number does not match and locked me out.
I have not been able to get any help online or by phone. The phone message says to do all contact online. There is no way !!!!