COD vs Shipping Options - HELP

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How can we link COD to a specific shipping option or the other way around.

I have 2 shipping options and 2 payment options, and one of the shipping options dose not accept COD.

The problem I'm having now is when customers select for example (DHL) and move on to the payment option they select (COD) , the problem is DHL dose not support COD in my case, I need to prevent them from doing that.

I hope I presented the issue in a clear way. 

I would really apricate any suggestion or apps recommendation.