Roses

I have been having problems with roses for years.Some green lettle insects get under leafs and eat everything!!!Leafs get black spots than holes.....
I spent so much money on sprays and everything else that kills insects......but nothing works!!!
I did everything !!!!
Someone told me to get knockout roses......I did....and I have the same problem!!!!
I heard not long ago about coffee grind....I'm working on that .....still I can't tell if that helps.
Please,please,help me!!!!
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