When I realized what happened, I called customer service and humbly inquired about whether they would be willing to extend the 0% interest promotion once more given my stellar payment history with the bank.

Then you can take action in a specific direction. 

Sounds good to the customers though, got someone charging them for 20 minutes of work.

I have done some direct mail, but it seems to be pretty ineffective to me, it is much easier building clients organically by networking with people in your real life, joining meet up groups, and just talking to everyone about what you are doing.

@James SyedI worked with the VP & Branch Manager of the Rock Hill location, and he directed me to the right people after that.

In this market, however, there’s not a lot out there so some people are using direct to seller marketing and are finding success that way.

We found littler, custom-package guys here www.helpsafestay.com, but we prefer to work with someone in person. 

We found littler, custom-package guys here www.helpsafestay.com, but we prefer to work with someone in person.

I know I'm not directly answering the question, but I hope I've giving you more to consider.

In commercial I stay busy with direct clients.