Thanks for your suggestion so here what happened. I have reached customer support with all the evidence but they asked that buyer is saying that you didn't complete his job but to be honest I have completed his job he extended 5 days for more clarifications before he approved after five days he came up with saying you have done a great job he approved my delivery and rated me five star.. then he disappeared he came up after 10 days with saying and I need a refund. and he cancelled the order. Once a person told me that in Fiverr the buyer is always right hence approved so fellow members be aware from such type of people