Boat — Received a faulty product for the second time

On 19th June, I sent wireless to boat and on 3rd August, I received the replaced product which was again not working properly. So, I sent the product back on 5th August and on 31st August, I received the product which is again having the same problem. It seems like the company is again and again sending me the same faulty product. I even mailed them but there was no revert and even tried to call them but no one picked my call. So, I would like to request you to look into this matter and force boat company to either give me a proper working product or refund my money.