Like I said I'd have done it for $200 but i think you prob underestimated how long will take, even if you could do 1 hh every 10 mins thats 6 hours work.
But to get 6 done per hour would prob be rushed which is why you got a half assed job.
Don't get me wrong I think $200 to do this is fair enough but should have made them go back and finish the job rather than give them $150 and then expect someone else to fix their mess for $70