In the instant case, bad faith was not at issue and appellees proceeded only on the theory that appellant had caused them unnecessary trouble and expense. Compare Bowen v. Ken-Mar Constr. Co., 155 Ga. App. 53 ( 270 S.E.2d 283) (1980); Jackson v. Brinegar, 165 Ga. App. 432, 436 (2) ( 301 S.E.2d 493) (1983). Our review of the transcript demonstrates that the instant case is virtually indistinguishable from Ideal Pool Corp. v. Champion, supra at 384: "There was a bona fide controversy as to causation — as testified to by the experts on both sides.