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You can see that Yahoo customer service cost is strat from $49/ months. It varies for different service and number of services. And, if you wish to close premium membership then you must apply for it before your time period over for premium membership.
Yeah, sure, you can use our live chat assistant to know Yahoo customer service cost. Actually, for it, you only need to access its official site and then you will get a live chat box on the right pane of the screen. And, for further queries, contact our support team.