TCR campaign declined

Our campaign was just declined. The campaign registration is geared towards marketing SMS messages. We do not send any marketing SMS messages to our client. We ONLY text clients when they text us first. How are we supposed to get a campaign approved when it asks us for specific opt in wording that we send to clients? They opt in by texting us first and we therefore respond. That's it. I don't understand how this is supposed to work and it's completely ruining small business SMS.