Poor service delivery

MY discovery 4 SE VIN NUMBER SALLAAAF3CA610096 YEAR MODEL 2012 WAS TAKEN TO WALVIS BAYTO RECTIFY THE JEKING PROBLEM . AGTER 31 DAYS OF DIFFERENT TESTS SUCH AS RE-PROGRAMMING THE REMOTE CONTROL, CHANGE OF SOLENOID AND SENDING FUEL SAMOLE TO RSA THERE WAS NO IMPROVEMENT. I HAD TO INSTRUCT THE WORK SHOP MANAGER TO EMPTY MY TANK AND RE-FUEL 15 LITERS OF DIESEL AND EMPTY FOR THE SECOND TIME AND FILLL HALY TANK. THE PERFORMANCE WAS BACK TO NORMAL. THEY GAVE ME AN INVOICE OF R3718.34 FOR CHANGE OF SOLENOID AND LABOR . MY CAR WAS SERVICED FOR THREE YEARS IN WALVIS BAY AND THERE WAS NO RECORD. THEY DID NOT RELEASE THE CAR DUE TO CASH PAYMENT DEMAND. I HAD TO CALL WINDHOEK OFFICE TO ASSIST AND YET HAD TO PAY R983.25 TO LEASE MY VEHICLE.