5 Months of Incorrect Billing and No Resolution

Has anyone had a similar experience that can provide help to the following?

For five months now, I've been calling Adobe (at 800-585-0774) about incorrect billing with no reimbursement, and even more frustrating, no resolution. After switching my billing from my personal account to my business account, Adobe began double-billing me by not only charging my business account but also my personal account, and for more than I had been previously paying. This has been going on for five consecutive months now, and I called after the first erroneous billing and have been calling every month since. After getting my bank involved, they stated that it is an Adobe issue that can only be resolved by Adobe. My bank even contacted Visa to no avail, as Visa stated the same. At this point, I've given Adobe all the pertinent details that both my bank and Visa advised, and for some unknown reason, Adobe still can't "find my billing issue." I've been told several times that it has been escalated to their SAP Team, but I still haven't received a resolution and have never been contacted by the said SAP Team - nor have I been given any information on how to contact them. After being given a Reference number, every time I call, it's as if the case is being opened all over again, with the same inability to read the comments previously made in the reference number file report. This is beyond frustrating. This is simply unjust and unprofessional. I feel that this is being outsourced overseas as a way to exhaust people's patience until they give up trying to resolve this issue. My bank has now stated that if Adobe does not fix this and reimburse me, the only way they can rectify the situation is by closing my account and opening a new one. That is flat-out unacceptable. Per the recommendation of my bank, I'm also reaching out to the Federal Trade Commission to file a complaint and send a letter documenting my issues. Is anyone out there who has had similar problems that's been able to find a successful resolution by getting reimbursed and having the charges stopped? I can use all the help I can get.