Eureka Forbes — Invoice/ bill not provided

I have recently purchased Aquaguard from Eureka Forbes from their official salesman. The salesman said that he will provide the bill once the product is installed. But it's been more than 5 days now. He has been making excuses everyday to not give the bill. Called him multiple times in cell and messages but no responses. I have complained to Eureka Forbes customer care as well but still no resolution. This is complete harrasment.