[Truist] Enable electronic payments for freelancers

I am a freelancer. I receive payments from a business customer of Truist Bank who uses online banking to pay me. Truist sends me checks in the mail that take a long time. I wish I could receive electronic payments. There is a phone number on the checks for questions. I called it, and after significant fighting with the VRU, reached a third-party company who told me I'd have to call Truist. She transferred me to the general customer service number at Truist. Because I don't have a Truist account, I had a much bigger fight with their VRU but eventually reached someone. He gave me a number to call, which turned out to be for FISERV. Naturally, FISERV wouldn't put me through to anyone because I don't have an account. I realized that the agent from Truist didn't understand what I wanted. So I called Truist back and fought with the VRU again. I reached someone and told him not to direct me to FISERV. I ended up getting the phone number for the nearest branch, in another state. The bank employee said I'd have to ask the payor to set it up. I explained that when I use online banking with my two banks, I have no control over how they banks pay the payees. I asked if Truist was different. She said all banks are the same. I said it's obvious that she also didn't have any idea what I was asking, and I wished her a nice day and hung up. Can anyone tell me if what I'm asking for is even possible? Should I call FISERV back and enter my personal bank account number? And does anyone know why there's a phone number on the Truist checks to call for questions, but I can't call them without an account number?