Unacceptable noise from BP Service Station

I live very close to the BP service station in Swartkoppies Road, Alberton. for the - I think it is the third day in a row now - the petrol attendants have been blowing some sort of Vuvuzela-like instrument. The police have called twice already at my request but it still continues intermittently. It has been driving me insane. The attendants say it is some sort of competition. Could the management please note that the service station is in a residential area and this sort of noise is unacceptable. The staff treat complaints as a joke.