Poor service maintenance

I am writing to formally express my dissatisfaction with the service I received at the Bosch R55 Service Centre. Prior to bringing my BMW in for a major service, I had never experienced any issues with my vehicle. Unfortunately, since the service was carried out, I have encountered multiple problems that have raised serious concerns about the quality and integrity of your work. Firstly, despite having paid for a major service, warning lights indicating that service is due began appearing on my dashboard shortly after well before a year has passed. This suggests that either the service was not properly completed, or the system was not correctly reset. When I contacted the service centre to raise my concerns, I was advised to bring the vehicle back in for a brake fluid service at an additional cost. This was never mentioned at the time of the major service, and I find it unacceptable to be charged again for something that should have been included or at least flagged during the original service. Furthermore, the sound of my car has noticeably changed since I brought it in, indicating that something may have been improperly handled or possibly damaged during your service. This is extremely frustrating and concerning, as it seems I am now left to deal with problems that did not exist before. I strongly urge you to investigate this matter and take accountability for any oversight or damage caused during the service. At this point, I cannot in good conscience recommend Bosch R55 to anyone. If no resolution is offered, I will be left with no choice but to escalate this matter further and warn others about my experience. I expect a prompt response and a clear explanation of how you intend to rectify this situation.