Sounds like they are trying to fix by trial and error. They changed the headlight module and it did not fix the problem so now they are suggesting the turn signal/high/low switch on the column.
Tell them to refund the original work and put the $ toward the column switch or tell them to re-install your old headlight module.
Ps. I paid $432 for the canadian version headlight module with daytime running lights so I would think you could get it much cheaper in the US.