Repair work to hail damaged vehicle

On the 16th of November 2015 my vehicle was damaged during a hail storm. Hollard appoint Aldan panel beaters to repair the damage. Aldan however advice that it is too close to the December festive season and that we should bring the vehicle for repair work by the 11th of January 2016. On the 11th they notify me that they do not have all the spare parts and that I must bring it back on the 1st of February. I inform both Hollard and Aldan that I am going on leave as from the 18th of March and they must ensure that the vehicle is ready for my trip to Mozambique. I was promise that they I will have the vehicle ready in time as the repair work will only take 3 to 4 weeks. We are now in the 7th week and the vehicle is not ready. After many emails and calls to Hollard they promise me that the vehicle will be ready by Friday the 11th of March. The vehicle is still not ready and they cannot give me an answer on when it will be ready or whether they will give me a replacement vehicle for my holiday in Mozambique.