Poor repair of car vent

Having taken my car to the above garage to have the two front windows fixed as they were not closing and also to have the vent closed when I am driving down the road.

the following happened:-

The total bill was plus minus R7,300.00 and the windows were fixed.

However the vent to close out air outside of the car whilst driving was not fixed and the service manager, Mike, said it could not be closed as the new cable was faulty and he also said that it is not possible to seal outside air.

Having driven for fifty years, I have found that it is possible to seal out the outside air and also this is faulty workmanship as the cable doesn't allow for opening and closing the vent I don't understand what I paid for.

I therefore seek a full refund plus fifteen percent interest and seen as they are not capable of doing the job, need to make arrangements to take my car elsewhere.