I have sent my drone to a DJI authorised shop to get the front arm repaired and they still don't have the parts from DJI, does anyone know when they will come? I have waited a few weeks now!

Ive send mine with the same Problem back to the official DJI Department in my Country. Ive got it back today and have become an new (or refurbished) mini back.
I think the official Repair Places exchange the drones in most cases and ship the defective back to china for refurbishment.

I believe I saw front and rear arms on ebay, so parts should be available.

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Reply from the repairers: DJI most recently promised that the parts would be shipped to us at the end of the Chinese New Year holiday, however DJI have now extended their holiday until the 10th of February due to the virus epidemic in China.