INCOMPLETE REPAIRS!!!!!!

I waited a month for my car when I was told it would take two weeks to repair on the day I went I went to collect the car upon inspection I noticed that the car was not fixed properly the plastic thing at the bottom of the door needed to be replaced this was on the 11th of April I then escalated this to the lady who was assisting me Chaylene who then told me that they will order that part and call me to fit it in since it takes 10-15 minutes I followed up on the 16th of April I did not get any joy then I sent her a message on whatsapp on the 23rd still got no joy on the 28th of April she said they will have it the following week today its the 11th two weeks later that part has not been replaced its a month later I am still driving with a car that was not repaired fully I am absolutely disgusted by the level of service from these people I will also escalate this to my insurance company