How to prove that the complaint in the FAS-spam — abuse of the law?

The user (competitor) signed up for announcements of educational programs on the website.
After receiving another letter (after 4 months) has petitioned the FAS.
Special emphasis is that we are unable to provide written consent. On the face of the abuse of right. In every email there is a link to the formal reply, in the log there is information on the subscription date, the date of discovery of the letters for these 4 months. During this time there was pre-trial settlement: there were no requests to stop sending (either in written or oral format), no referrals in the letter.
At the moment, wrote to the customer manually, in the logs there is evidence of our ip.
Is there a way to prove his integrity?
July 2nd 19 at 17:16
0 answer

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