wrote in message

My question is, what should my next course of action be? Dig up the
entire line? Get another opinion from another plumber to repair
blockage? Have another inspection? What's your experience of the
cost involved? Any suggestions would be much appreciated!

Drowning in my own....

I don't think you have much choice. In reality, $3300 sounds reasonable for
the amount of work to be done. If it is collapsed, you'll end up replacing
the entire line anyway, either now or later at even higher cost. Once the
equipment is on-site, it is cheaper to just keep on digging instead of
making a second trip in a week, or month or year.