CouponCabin review: customer service / policy transparency

They flagged my account for what they deemed "unnatural activity." Additionally, due to this flagging, they would no longer allow me to receive my cashback electronically (through Paypal, for example) and would only send me paper checks. When I inquired about these problems, they refused to explain what this activity was or why it was flagged. All they would tell me was that this problem happened and there was no way to ever resolve it. I had to either accept paper checks from them henceforth or no longer be a member. They stated that their terms and conditions
covered this, but when I asked where the relevant passage in the T&C was, they ignored me. I couldn't find it. At no time did they claim that I violated their T&C. I complained about their lack of transparency and stated that I might have to look into whether or not this was a legal issue, and they promptly closed my account
and told me that it could never be reopened under any circumstances. They will not respond other than to tell me that I have to write a letter to their legal department, at which point they'd get back to me within 30 days. So, I am left not knowing what this unnatural activity was or whether or not it poses a threat to my system. It feels as though they are dodging my inquiries, thus putting my network at risk, and it feels as though they are hiding something. It is not clear to me why they can't
explain what activity was flagged nor where in their T&C this situation is covered. I don't know if it's a coincidence or not, but I've got over $75 in pending payments that have not yet been paid.