Mercedes-Benz Certified has sold over 20,500 units of pre-owned cars over the last five years and witnessed 20 per cent cumulative growth, Schwenk said.Commenting on overall market conditions, he said 2020 has already turned out to be a challenging year for the company."Our sales has been affected due to the ongoing macro-economic headwinds, COVID-related challenges and unavailability of volume models in first and second quarters," Schwenk said.Asked if the company could match up to its sales performance in 2019, when it sold 13,786 units, he said, "It will be a very difficult task from here onwards to compensate the loss of a quarter."The company expects demand returning only by the festive season, he added.With customers hesitating to go.