Complaint about the service

On the 30/12 /2019 I bought a water pump for BMW x1, I waited 3 days to receive it, on the 03/01/2020 after calling numerous times enquiring about the pump. I took the pump for an installation to a registered and experienced mechanic. I then traveled to Mpumalanga on the same day. On the 05/01/2020 I started experiencing problems with the car and I got a technician to assess it and I qaa told the pump was faulty as it has stopped circulating water and I had to return it to BMW. I traveled from Mpumalanga to Joburg to return the pump on the 07/01/2020. I was advised that it Wil take 5 days to receive a new pump as they had to lodge a claim with a manufacturer. I provided all the paperwork requested. It has been 8 days now and I still have not received the pump they do not call me to update on the claim I am the one who always have to make follow up, I have spoken to Sashan on numerous occasions and he keeps telling me that the claim is still being processed. I am not happy with service received and I feel like BMW does not value me as a customer. I bought the part from BMW becouse I trusted them but it didnt last and to make matters worse they are taking time to replace it. I am being inconvenienced as I had to leave my car in Mpumalanga and I am being charged a storage fee. I hope this will reach the right people who Wil take me seriously a d resolve the matter urgently