Just had this happen to me - luckily I figured out they were not QB Intuit before I gave them payment.  Same scenario - My Quickbooks suddenly froze up ( i think due to an update but am unsure)  I tried closing and reopening and that wouldn't work.  I googled QB Enterprise support and came across a number [removed] and I called it and I can't remember how they answered but I believe it was intuit support.  I was in a panic and not thinking clearly until they told me it would cost me $1249.99 to purchase data recovery.  Of course when you think of all the data lost, it was going to have to be worth it, UNTIL, he told me that Internal Accounting Services is what I would see on my CC.  I said oh no, we are not doing this.  I asked point blank if he was QB Intuit and he did say no.  I deleted everything he installed on my computer, restarted my computer and voila, my QB works just fine.