Complaint Review: advent product development

Advent is an untrustworthy company that claims to patent and promote inventors products.
After spending $8500.00, the finance department contacted me demanding me to pay the product in full. I then told them I haven't received any information from anyone in the company.

They told me they would have to sue me. Once I told the to go ahead and that I will get a lawyer,
not only did the harassment stopped, they also disconnected all contact telephone numbers.
At this point, I'm beyond frustrated and I want justice to be served! I want my money back because the services they promised were never rendered to me.

If you have any information about this company or know how I can get my money back, please contact me.

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