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It sounds like although this was referenced a free trial, a subscription may have been created with the merchant. This is often the case with merchants who offer free trails for 1 month, 3 months etc. It will be noted in the merchant's Terms and Conditions that a subscription agreement will be created and payment will be taken on a monthly/yearly basis. I'm afraid if you signed up to this free trial you agreed to the subscription agreement and there would be no evidence of unauthorized activity on your PayPal account. Please ensure you have cancelled any agreement that may still be associated with the merchant.
I understand they may be hard to get in touch with. If they have a Facebook or Twitter page, they may respond to messages quicker than email. I apologize for the inconvenience.