Here’s a clearer, more polished version of what you wrote—firm, factual, and suitable for raising a complaint or escalating the issue:

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Reworded Version

My order did not match the product packaging shown online. I received a completely different package and colour. I was advised to return the item and was told in writing that the return costs would also be refunded.

However, I was only refunded for the product itself. When I questioned this over multiple emails, the company backtracked and claimed they do not refund return costs. They then accused me of sending “threatening emails,” yet the person who made this accusation did not sign their message. When I asked them to specify which part of my emails they considered threatening, they ignored the question and stated that the matter was closed.

I will be taking this further.