Charged me $400+ and over 4 months to ruin my bloc...

Charged me $400+ and over 4 months to ruin my block by pulling the head studs without asking me first. Steel studs into a 40 year old aluminum block meant they were essentially welded in. Ruined the threads. Tried to "fix" it with a Helicoil that promptly pulled out as soon as I tried to torque the head down. Wouldn't own up to it and wanted 2 months to try to repair their repair.