If you follow the steps and instructions sent to you by PayPal, they will eventually unfreeze your account. But of course, that is subject to their investigation and decision. But more often than not unless you made a serious violation they will unfreeze your account.
Sorry but we do not take note of the payment methods of our suppliers, although we do check that they accept safe payment methods. You will have to inquire directly with the supplier of your choice if they accept alertpay.