In September of 2020, I opened a Sweetwater account which is a musical instrument distributor. I made purchases, and payments were made through the app on my phone. This system worked perfectly until this past July when my payments started getting rejected. Nothing was changed on my part- account/routing numbers, nothing. My bank, a credit union, looked into it and saw no irregularities. After speaking with 7 reps, an Account manager, sending certified letters, the only thing Synchrony could tell me is that this issue exists only with Credit Unions. So basically, it's up to me to somehow get a payment to them. I don't use debit cards, and I haven't used checks in years. My CU said nothing has changed on their end. So now I have to physically mail in a payment which I don't have time for. Neither institution knows anything. How does something like this just stop working?