How to get rid of moles and voles?

about 4 years ago, i first started seeing mole tunnels in my lawn - what a nuisance tamping them down before mowing so as not to shave off sod. well, i let time go by without being pro-active and people tell me the moles have eaten all the grubs - so the voles now use the tunnels to get to roots of all my perennials. my gardens used to be lush and carefree - now, there are smaller plants and few blooms. and some gone entirely! the useless pests seem so invulnerable [invisible , for one! never spotted one of either pest] so i was always discouraged to try and untrusting of any product claiming it worked. i am so disheartened by my languishing gardens - i need these useless and damaging animals dead and gone.

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