Appalling service

Hi, this is more of a follow up regarding the poor service i got at imperial when i bought an audi A4 a year ago was told maintenance plan is still with audi to my surprise no when i got at audi, then the manager Donovan same sales agent who **** to me decided to take accountability and pay for my service but hear is more when they did the service on my car a breather was not replaced as it is ****ed up and funny enough the service was not written on the book but i can prove it was not changed as my father co-owns sparklight gearbox and utilised their machine to check the car what was wrong.I had thought it is fine i am moving on they sold to me ********* worse part a manager did that however this is the second strike my car was not fully serviced as the breather was not changed and it comes with the service kit, what makes me even more perturbed is that from last week friday i went in to notify them as physically challenged as i am recently up until today no response.I called in three times yesterday nothing i do not want to lie if i do not get what i want i am willing to take my time my money and take it up legally