Changing return to one way rental
I made some mistakes in planning a trip to city A and now need to fly into one airport and depart out of city B. I had an Avis rental for the original ticket (into and out of city A) but now that reservation wont work as I need to return elsewhere. I tried to change it or make a new rental online and it's clear that the location wont let go of any more cars, they have plenty of options if I keep the return as that airport, but nothing if I do a one way and drop at city B.
In the past I have often changed plans and had no problems, I am under a large corp contract and we have no one way fees, at most some locations can charge us mileage. I have no idea if the fact that the location wont currently allow a change online means that I wont be able to make something work once I land and drive away for a few hours, any ideas?