Poor service by Rodney the Manager

I bought a car at the end of June 2018. I have been dealing with the manager called Rodney and I'm failing to understand why he even is a manager. He said he will take my car to service of which I don't believe it's true because my car keeps alerting me that I need to service the engine. Now I have the car and no service book. He said he will go get it stamped because it was never stamped after the service. I've been calling him over 2weeks asking for the service book and I even went to the place an dhe kept telling me it's at the other branch and he will get it here till today. Now he is ignoring my calls. All I want is the damn service book. Why the **** is it take over a month to get a service book and to get it stamped? I WANT THAT ****EN SERVICE BOOK because he confirmed that this car has one. Now that they have a sale they don't give a damn. The aftersales service is ****