I haven’t missed an invoice before, but I have bought my 2020 GMC Sierra 3500HD AT4 Duramax through TheJensenCompany.com. Support was one of the best parts of my experience. I’d send an email and call them today. If you’re within driving distance, I’d personally go to 12034 SW 104th Terrace, Augusta, KS 67010 and talk with someone in person. I’m sure they’ll explain what your options are.