mahfuzha

Hello, I just finished 42k words translation from Hindi to English. Buyer agreed to do milestones of 2 orders 100$ each. But when I delivered around 22k words of first milestone, he asked me to finish the rest, & then he will order the second milestone. Now I've delivered the full work. He is refusing second milestone & initiated first order cancel request claiming I've not done a good job. So I asked him to show me where I'm lacking, he sent me a few pages with elaborated sentences using some info & words which are not even present in the Hindi document. So I've decided to reject his cancellation request. I worked on the full book for 7 days, & now he doesn't want to pay me at all. If I initiate a cs request to interfere in case the buyer insist on cancelling, even though Im right here, can fiverr penalize me for being adamant not to accept cancellation? I cant find any specific guideline on this.