Google G Suite Email Contact

Is anyone here from Google's G Suite or email department? I recently acquired a brand who's domain is being blocked by Google Mail ("G Suite"). I have followed all of the steps to be compliant (SPF and DKIM), but email is still going into customer's Spam folder at Google. There is not a massive amount of emails sent, just basic communication such as monthly invoices, support tickets, etc. If anyone has a contact, please share it with me on or off list. I would greatly appreciate it. Thank you! Jason Canady Unlimited Net, LLC