My response would be something like, "Thanks for the call, however it's best to not bother coming out."
I'd then call DirecTV and ask what the heck that was all about.
In the past that happened occasionally,
It went something like, "customer must have pole in concrete + 100ft cable dig in + insisted upon cavity work for two receivers + wanted three mirror TVs from the club room. Was presented custom labor estimate of $400.00 above FREE installation service."
Then Directv would tell the customer they were under no obligation to use the installer for the extra work; they could do it themselves or hire someone else to do it.
Now the bid to do the FREE installation for Directv needs to go up. IF Directv declines that bid they can do it themselves (which they are trying) or find others to do the installations (they have been doing that also but the turn over of techs has made quality circling the bowel.)
Most techs discover they have been working for free and quit. The next step is paying for the position of dish installation tech.
Joe