If I buy something from a bill me latter sight such as stoneberry what happens if I don't pay for it.?

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I bought 2 guitars from stone berry they send the item and you pay later PLEASE help I don't think ill be able to pay for it at all. but id like to keep it without paying and let them kiss my shiny metal azz.

If I buy something from a bill me latter sight such as stoneberry what happens if I don't pay for it.?