I think it was Gus, or someone working for Gus, who left the note. Gus had a personal vendetta with Hector after he murdered his business partner right in front of him. He surely had the opportunity to kill him many times but wanted to break him first. Remember the trips to the nursing home where Hector woudn't look at him? Gus kept visiting him "Is this the day Hector?". He loved to torture him with news that this friends and family were dead. Also it seems likely that Gus was getting his product from the Cartel and he showed in BB that he would do almost anything to keep the supply flowing.
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