BMW Sandton accelerator pedal

I went to BMW Sandton bought an accelerator pedal for my brother's car which is in Malawi. I got the pedal and sent it across once it was there my brother immediately said the pedal was faulty as it was raving by itself while he was outside.

He then sent it back to me of which l went to BMW Sandton. Nishaad the parts sales consultant said he will try help and he took me over to the service manager Warren. The pedal part number was different to the one for my car of which Warren said BMW had upgraded the parts so the one l was given was the correct one based on the upgrade. Warren then contacted his other 2 managers who were both away at the time as the date was 22 December 2020. The other managers who are Curtis and Karabo never bothered to reply to the email sent by Warren since the 22nd of December. However Warren did come back to me saying l should bring the car in at BMW Sandton for them to test what the issue could be so they can replace the pedal but l did say the car is based in Malawi and l won't be able to bring the car as that is far and costly for me, this response l got it on the 5th of January 2021 from Warren. I did urge him to try speak to his supervisor and the other managers again since l could not bring car around all l want is the part to be replaced or to get a refund coz as of now l paid for the part brought it back BMW Sandton took it back but did not refund me at all or get me another part. And just getting a reply from Curtis or Karabo has been fruitless.

Please help me as they have taken both my money and the pedal