Hey guys, a few questions for you both. First, were all the charges made at right about the same time? It is possible that you may have subscribed more than once by clicking the premium button quickly in rapid succession. Usually the system tries to stop you from doing that, but it is possible sometimes given the right circumstances. If this is the case, you can check by going to your subscription page and seeing when you're next renewal is. If it's greater than one month away then that's what happened and now you have subscribed a few months ahead.
If you check your page and don't see that, it's also possible that what you are seeing are holding charges that will go away after a day or so. If they don't go away in a few days, you don't see extra months of premium, or the charges weren't all placed on the same day, then you will want to get in touch with support. Note that if you receive an automated email directing you to the community and/or help boards, make sure you reply directly to that email (even if it is from a no reply address) and support will get back to you as soon as possible.
Hope this helps, and please let me know if you have any other questions.