Mesos rolled over when passed 2,147,483,647

I just sold over 2.147b of goods in my shop. When I went to collect it from Frederick it said 0 mesos available. My mesos rolled over the max int value into the negative. Why not implement a system to auto exchange mesos once you reach over 1b? or implement BigInt from gmplib.org/ library to account for large values of mesos? Is there any way to get my mesos (or sold items) back?

edit: IGN Teas
        image When I collected my items originally it said I had 0 mesos. I sold 100 10% claw attack scrolls for 20m each and a few other items putting me over 2.147b.