ping-ponging
n.— «Asked about “ping-ponging,” a phrase used to describe how hospitals and insurers negotiate payment over the course of months, without letting consumers in on the secret ping-pong match until they’re stuck with bills they could have sworn were already paid, Grady noted he has some experience in that area.» —“Naples attorney elected to Legislature unopposed” by I.M. Stackel Naples Daily News (Florida) Oct. 10, 2008. (source: Double-Tongued Dictionary)