A customer refuses to buy the product i promote rather requests me to suggest a better product in market, Should i suggest him/her other product?

With good approach and understanding, i will do my possible best to convince him or her to buy my product, because i really know much about my product and i know it will really satisfy his or her needs, so i will not speek about product i don't know much about its contents

YES

whY Not, ill tell the customer about other product but i prove that my one is right one for him

I will stop selling for movement and try to understand customer's need and speciality and build a relationship with him not only for selling the product but a prospect as well to customer's requirement with my potential 

yes. But I will look further to understand his/her needs well before making any suggestion

Yes i will suggest other product that is good but also promote the goodness of my product

yes, i will suggest another product to my customer and explain to him/her the product discription.

Try in a smart way to check his / her needs for the product & start to highlight the unique selling proposition of your product.

Try to find an outlet to avoid talking about the competition directly unless you know by heart the difference & you are able to well explain highlighting the strengths of your product.

Good luck !