Old mutual insure rejected car claim

I've had a car insurance claim registered on the 4th of February 2019 I was required to send threw full service history and motor plan history. There after a siu was assigned and requested phone records for a cellphone number that is not registered on my name and the owner refuses to had over that information as she is an attorney. I was then asked to send threw proof of the contract owners details which I did. There after only a month later my car was uplifted from my premises and I was asked to sign charge of ownership. When I called in for a update on my claim I was told they still waiting for the siu report. I had made numerous calls and was finally told the report was completed on the 27th March 2019 and had to be decided by management at they Friday meeting on the 29th of March. I called in on Friday and was then told my claim was rejected and I would receive a rejection letter stating reasons. I then called in and sent numerous emails requesting the rejection letter and received no response. I called in again and on the 4th of April 2019 I was still told the letter has to go threw they team before it can be sent to me. Today is the 12 April 2019 and I've still not received any feedback or rejection letter. My car has been lifted almost 2 months ago and transfer papers signed, the 1 month car rental has expired, my claim hasn't been resolved since the 4th of February, No one can give me answers regarding my claim or reasons for rejection, to top it all off I was previously insured and was called by old mutual and offered a better rate to change insurance companies and now I'm left in this dilemma I would never recommend old mutual insurance to anyone. If anyone can help or had the similar experience with them please let me know how I can have this solved.