OnePlus India — oneplus sold me a different and defective product and now they are very careless

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Bangalore, Karnataka, 560066

I ordered oneplus 5t silicon case from oneplus.in i ordered a red colour case but mistakenly it was selected as black and i received a black colour case. I called oneplus customer for the replacement of the red but they refusing to do that. Mistake is in oneplus website but now they are cheating me. I want oneplus to change the colour to red or i want them to refund my money back. Black never suits my phone and black is something bad sign for me... We never use black in our house. My money is totally looted by oneplus... I want a immediate solution...
Order no. Is m[protected]... Call me at [protected]