Charging the Customer for Repairs Whilst Vehicle Still Under Guarantee.

On two separate occasions Philwest (Somerset West) have insisted that I pay for work and parts when the problems were reported before the guarantee was over. First case was the left hand rear door on my Amarok was not locking when using the remote and this was reported to the service manager, Henry, who told me they would repair it at the next service. When the next service was due, he could not remember my having told him earlier about the door lock problem and there was a great deal of persuasion necessary to sort out the fault under guarantee. Subsequently two more door locks packed up and I was "made" to pay for them, R5970.70. (They did not charge me for labour.) It seems to be a common fault on the Amaroks---door locking system faulty, so surely VW should recall the locks and replace them. The second case was an oil leak on my Combi at about 50,000kms, which, they say was fixed, however, the leak was not from the sump plug (which was what they attended to, but was not the problem). When I checked again at 62,000kms. the leak was still there and on closer inspection they noticed oil coming from a pipe leading to the turbo. This was the leak they should have attended to originaly, whilst the car was still under guarantee. Philwest refused to accept that that was the original problem and charged me some R5533.90 for the part and labour. After a great deal of discussion, Mr. Davison, the dealer principal offered to halve the bill. When I went to pay they asked R2932.68, which is not half of the original bill. I finally did pay 50% (R2766.95) but feel that they should have covered the payment for the leak, as they had mislocated the problem in the first place while the Combi was under guarantee.