i think they messed up while installing the new actuator
i installed one last week, there's a little cable ball that connects to the rod(pop up thingy) that has to be pressed prettey hard back in, if they didn't do that, it might have jumped out and now it's not working
that's just one possiblities among others, if they did the work, i'd take it back to them and let them know about it, be very firm