I haven't tried Bitwine yet, but i've heard of their services, they're good.
If they're overcharging you, you can talk to their customer services. They're sure to have a "Contact Us" located somewhere.
Or you can checkout their support page:
Help : BitWine
The payment process
Quote:
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You will not be charged at the very beginning of your call. First, you will get a brief free consultation in which you and your Advisor will introduce yourselves and agree on the topic you wish to discuss during your call. Once you both agree to go ahead with the call, then charging can begin. At this time, you will be asked to choose how much BitWine credit you would like to purchase for this call. The credit you authorize is not your payment, it is merely your way of saying, " this is my budget for this call, please warn me when I reach that limit".
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So, from what i can see, verification of your paypal is NOT necessary at all. As long as payment is done on time, they should have no right to charge you anything other the due amount.
If they do, it's better to find a way to complain... but first, best you check from their support sites and find out if this verification is necessary. If anything, i think they're not following rules there.