Roof sales agent / operations manager repeatedly said they do 6 nail installs, not 4 nail like others, inducing sale. Post install, owner claims only 4 (fraud/unfair trade practices?) Importantly, work appears grossly negligent. 5 nails on most shingles, nailing patterns grossly deviate from manufacturer instructions leaving half of each shingle poorly secured; makeshift starter strips preventing self-sealing, starter strips not secured 2-3" from edge; improperly driven nails; high nailing; excessive shingle overhang leaving < 2" exposed gutter; underlayment cut substantially short of eaves / drip edges; missing drip edge on majority of backside where hard to see (deceptive), drip edge applied over underlayment at eaves, not secured every 12", distorted/short in some places; exposed nail heads; displaced siding, unsecured gutter; old, unpainted, damaged, and missing flashing; significant light streaming into attic, path for wind driven rain to enter. Manufacturer material explicitly states they will not honor warranty if not installed in accordance with their instructions. Most of the above work appears incorrect from reading of the manufacturer instructions and building codes. Damages like broken window, jchannel, rafter vents, siding; 6+ torn screens; bent gutters, crushed plant beds; shingle scraps clogging gutters, tar/debris left, etc. Has not repaired damages. May need complete redo to fix/warranty everything, avoid blow offs/water damage. He agreed to look into manufacturer warranty and fix issues before payment, then collections started calling the next day.