A Buyer ask for Extra work till Order cancellation, wasted my 3 days


#1

Today, I experienced the Worst Ever Buyer on Fiverr. He was very Polite till we started the Order, After I delivered the Order, he asked for Modification & Illogical extra work such as Grammar mistakes fix, Add extra features to the site such as Schema Markup etc
When i asked him that it was not included in the Order, he indirectly threatened me that “It will make me less satisfied”, when i delivered extra, he came again and asked for more Extra and I delivered again. Then he continued for demanding Extra till i Cancel the Order.
I don’t know how can we stop this… He wasted my 3 days almost.