I need help. Leaves curling down eventualy falling and small black bug on my plant

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I need help my leaves are curling down and falling and I dont know why. I saw some realy small black bug but they were so small that I-couldnt take a good photo even under a loup…It would be good I someone knows what bugs they may be so I can treat my plant. Or if someone knows why leaves look like this

Not enough info, it’ll take more than bugs to do that! Something is far off the spectrum! Way outside the envelope! Water? pH? Heat? Toxified soil? a number of things could be off! I would spray it with insecticidal soap if you’re worried about the bugs, but I’m sure it’s not just the bugs! Here’s what they should look like