Constant Contact: Email & SMS

I wanted this ap to help integrate mu email from Shopify to Constant Contact. I sent two emails asking for assistance, as it was not transferring. No reply to either. I reloaded today. it said once the link was complete it would upload the date to CC. That was hrs ago. No transfer. I sen another email. I am not sure the App really works. I can tell you the any type of customer service is non existent I only put on star so I could share our experience. We are looking for a different APP