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im trying to market my webpage to sell some products but i have no money to do so how can i go about it

30 day 100% full money back guarantee is not fulfilled by the company instead they are trying to avoid you by requesting informations that they already have. Everytime I emailed them about my refund they offered again their business. I know it is computer generated because they answered with the same text again and again. I was a fool to believe and trust them with their money back guarantee scheme. Other online business just refund or fulfill what they promise except HB Marketing Inc., NY that until now I have yet to receive my refund.
I wrote them with all their requirements and to send to their mailing address but it was returned to me. The exact address I used is the one exactly written in their webpage as per instruction. What shall I do now?