Bad Service

I am so disappointed in the Service I got when I bought my car at McCarthy Vw Gezina . I bought a polo vivo 1.4 pre-owned car from the branch it is not even two weeks and the car is making a funny sound I reported this matter and they pick up the car on Monday the 7th of May . They called me on the 10th to tell me the is fixed I picked up the car as I was driving back home the car start making the same sound . I then stop and called the Sales person Thabiso he asked me to bring the car back took the car the Assistant supervisor Clivin took the car for drive he said he did not hear this sound after I explained him the sound comes and goes it start when you drive the car fast especially when you change to 3 and 4th gear . I ask him to keep the car till it fixed he said I should bring the car on Monday my problem is they can not assist me with a curtsey car as he need a go ahead from his, Manage Russell I ask him to call Russell and explain to him my the situation he call and told Russell and told him the car needs to come back on Monday . My problem is that I bought this car for me to travel to work as I work in Joburg Rosebank now am inconvenience because I can not drive my car and need to use the train which is costing me . I called Clivin today to ask if he agreed with Russell for a curtsey car he said he will call me back which he did not he had the nerve to say to me that I should remember this is not a brand new car so my question is ? Does Vw McCarthy sale broken cars to clients so they can fix it themselves ? The car is not even a month with me and its already giving me problems the is a warranty and a extended warranty on this car. The day I pick up the car Russell was very rude to me and the Sales person that sold me the car Thabiso I mean he is just a sale person , is this how Vw McCarthy treats there staff in front of clients am so sorry to say Russell does not now how to treat employees . I work for a very big Company and never has my Supervisor or Manage treated me like Russell treats his people . The poor sale person Thabiso is so under stress because he does not know what to do with my situation if the Manager cant help him or give him the go ahead in fix my car . I right this complient because am very unhappy with the service I have received from McCarty I tried to call the office for someone to assist me but no one can because they need Russell to give them a answer . I please ask for someone in McCarthy to please call me as I feel like return the car because its just standing I'm my yard and I did not buy a car for it to just stand around am so disappoint in this Service .