FBCS Inc review: They sent the letter about some fake debt 1

I think that the company FBCS Inc. is big scam. I received a letter from them about the debt. This company stated that I owed money and needed to contact them as soon as possible. I didn’t have their phone number, so I replied to their letter. I asked to provide more details about the company and debt, because I doubted that I owed money to someone. But a week later no one replied to my letter. I think that they want to get money from the frightened customers.