White Dental Healthcare - Wrong dental treatment and also Legal action

Me and my sister got treatments from White dental clinic, Indirapuram. I had a root canal treatment whose crown was not made properly that I had to change after going to Germany. I have the receipt for the same. Also, he did the fillings but didnt cleaned the underlying infection. Due to which, I had to get it done again from Germany.
My sister, got treatment for multiple teeth. He put crown on all the teeth, that started having problem and as a result, I stopped going for further visits to this doctor. So, I had to go another doctor for correction of the treatment. Now we both published a review on google reviews that is a freedom of speech to tell people our honest reviews. They sent us an legal letter to remove the review and pay a huge compensation.