Section 4349 of this title shall not apply to any person who wilfully violates any provision of this chapter in connection with the imposition, computation or disclosures of or relating to a time price differential or service charge on a consolidated total of 2 or more contracts under §§ 4327-4332 of this title, and the buyer may recover from such person an amount equal to 3 times the total of the time price differentials or service charges and any delinquency, collection, extension, deferral or refinance charges imposed, contracted for or received on all contracts included in the consolidated total and the seller shall be barred from the recovery of any such charges.