BMW Standards are declining

My pre-owned 2020 BMW 220d vehicle was purchased at the end of March 2024 from BMW West Rand Roodepoort. The car was taken to BMW Menlyn in July 2024 for a service. One of the defect items reported before the service was that the passenger door handle was loose which I assumed just received fastening. The vehicle service agent at BMW Menlyn informed me that the door was worked on previously and the door light was removed and the entire door handle had to be replaced. This issue was taken up with the Sales Manager at BMW West Rand who informed me that he will not take any liability 5 months after the sale. The quality check report that he provided is very vague and does not show the level of check done. Based on the above, BMW West Rand is dishonest and should pay for the cost and inconvenience for the replacement of the door handle.