Writing my resumé, I don't speak native English as I'm

Non native speaker myself, but it's plural, so "customerS". the 's is only used as a short form of his or hers. As in grandma has a cake. So it's grandma's cake.

You're correct. But if you want to play it safe you can avoid the issue by saying "customer queries" instead, it's perfectly valid.

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>>17305898
Using [customers'] implies possesion, for instance "the customers' dog pissed on the floor".

It's not incorrect to say [customers' enquireies], as the implication is that you've responed to enquiries made (and therefore possesed by) the customer, but as a native English speaker I'd say it sounds a bit clunky. I'd say "responding to customer enquiries" (which implies you've delt with a number of individual enquiries from customers) myself.

>>17305898
One cat
two cats
one cat's hat
two cats' hats

one customer
two customers
one customer's queries
two customers' queries.

In your case, assuming you responded to the queries of more than one customer, customers' queries is right.

>>17305898
I want to fuck that rabbit

"Respond to customer queries"

Don't use plural forms, as the plural form of queries will already imply that. While >>17306438 is correct, it's redundant.

>>17305912
This. You had it right the first time. You could also say "queries from customers".

>>17305912
Do what this guy said and just use "customer queries"