Poor service

My husband purchased a Renault Captur in 2017 from Renault in Durban. Only to find out when we the vehicle went for a service that it was a 2015 vehicle which had already been serviced and sold to us as a new vehicle. Over the last few months the vehicle has been experiencing issues stating that the gearbox needs checking. Took the vehicle several times including having to buy a battery as per recommendation from the workshop at Renault in Tableview. We even had to hire a car as the vehicle was kept at the workshop for more than 3 days. Each time the gears stop selecting the battery terminals have to be taken out etc and then the computer box is reset. We were told it is the sensor in the vehicle. To date they cannot resolve the problem. Now we being told that the vehicle is out of warrantly, cannot get a courtesy vehicle, must wait for parts from France which will take awhile due to covid etc. The vehicle according to our records is still under warranty. Cannot believe that service we receiving is so pathetic