Blizzard White ripped me off for $94.31 Internet

I saw an ad on Facebook for a trial size offer for a tooth whitening cream.  It was $1.03 with $3.87 s&h.  Great deal, i thought.  Ordered it by filling out my name and address and debit card info.  It gave no further information, i thought it was a trial size order, nothing more.  Then 6 days later i was charged $94.31 for a 'membership'.  What?  I didn't join anything, i simply ordered a trial size product.  Right?  I called and was told i am not eligible for a refund even if i return unopened and unused product.  No explanation why.  Would not give me a number or address or anyone else to contact.  And rudely hung up on me several times because i kept calling back.  I can not afford to lose that much money.