Welcome to the Den of Deliverability!
Getting your email delivered and placed in the Inbox can seem like an insurmountable challenge. Spammers have made it hard for receivers (ISPs, filtering companies, etc.) to distinguish the difference between "ham" (mail that people have asked for and want to receive) and "spam" (commonly defined as Unsolicited Commercial Email/UCE or Unsolicited Bulk Email/UBE).
It takes a combination of adhering to the recommended best practices and technical items/configuration to ensure your mailstream does not match the same patterns/characteristics of spam. We have assisted many mailers with these items to ensure their efforts are successful.
Unfortunately, we have also had clients that want to pay us to help them "spam". This is NOT what we do! Just in case you didn't hear us -- THIS IS NOT WHAT WE DO!
As we do not have direct control over your actions, network and mailstream, all we can do as consultants are make suggestions. At the end of the day, you can choose to listen and be more successful, or you can choose to ignore us and do as you desire. If you were satisfied with the results of your program/s, you likely would not be searching for assistance...