Bad service and not meeting verbal contract agreement.

Hi I have bought a second vehicle Opel Corsa 2022 red by Group 1 Nissan Stellenbosch by the salesman Marius Carrolisen, with the verbal agreement that I trade my sons (Mr A A Jacobs) POLO GTI 2013 (GREY) then use R80000.00 of the second Opel Corsa 2022 financed to use towards the settlement of the POLO GTI 2013 (GREY) and the rest of the settlement will be sorted by salesman Marius Carrolisen, Watts and voice notes as proof , after contacting the dealer principle Johan Le Grange , we had an conference call and were by Marius told Johan Le Grange that he is helping me out and that he never stated he will settle POLO GTI 2013 , after seven months of begging and watts up and calls even visits from Marius the POLO GTI 2013 is not settled, so after the second conference call by Johan Le Grange and Marius i was told that GETWORTH is offering R95000.00 for the POLO GTI 2013 and I need to pay in R23000.00 as the settlement is R118000.00 , I requested that they e-mail me proof of the offer from GETWORTH as I will not believe a word that comes out of Marius mouth, so after sending e-mails on the 31 July 2024 , 01 August 2024 & 05 August 2024 to both Marius & Johan till today no feedback nor resolution. Can someone please help. Regards