Bad service by Discovery Insure Claims department

We have insured our cars with Discovery Insure. My husband was involved in an accident on Wednesday evening the 4th of October 2017, we lodged a claim with Discovery insure on the 5th October 2017. They arranged a courtesey car for us with Avis which was not in the group we pay a premium for. We paid a deposit of R1350 to Avis and were told to change to the courtesey car that we pay a premium for we have to pay another R1350 to get the car that we pay a premium for. We are still stuck with the wrong car inspite of numerous follows ups by my husband with Simphiwe from Discovery Insure claims department. Further to that Discovery insure was supposed to pick up the car for assessment last week Thursday, the car has not been picked up till today the 11th October 2017. Today I called to lodge a complaint to Simphiwe's supervisor and was attendend to by the Judy Mothoa who blatantly refused to give me Simphiwe's supervisors contact details. He instead took my details and said he will foward them to the relevant department. This is unacceptable for the premiums we pay.