Amazon Unknown Charges To My Space Coast Credit Union Account

I am writing regarding a series of unexplained charges from Amazon that have appeared on my Space Coast Credit Union account, and I am worried these may indicate possible fraud. I have been charged 1.37 a total of eleven times this month, usually on a daily basis, and the transaction description on my statement shows as “Amazon DIGI.” I do not recognize these charges, and I have no idea what they are for. I am an Amazon Prime member, but I am not using any other Amazon digital services, such as Kindle, Audible, or other digital subscriptions that would explain these repeated 1.37 charges. I noticed that these transactions started recently, around the last week, and they have been appearing repeatedly since then. I have not knowingly authorized any daily or recurring digital purchase for this amount. I tried to contact Amazon about this issue, but I was disconnected from the representative who was helping me, and I did not receive any case number or resolution. At this point, I am concerned that my card may be used without my clear consent, and I want this situation to be investigated thoroughly. I request that Amazon and, if necessary, my bank Space Coast Credit Union investigate these “Amazon DIGI” charges, explain clearly what they are for, stop any further unauthorized transactions, and refund the eleven 1.37 charges that have already been taken if they are found to be unauthorized. I would also like guidance on any further steps I should take to protect my account in case this is fraudulent activity.