Charged for a Cell Spot

Help! I am in the same situation where I transferred account within Tmobile and received a cellspot charge on my last bill on the first week of January  2024. I had no collection of ordering the cellspot and never received a cellspot. Initially, I called Tmobile to understand what the charge is but the customer service representative on the phone line couldn't help me because the rep said I needed to reset my pin at a retail store by verifying my government ID. After verifying my identification and changing my pin, I called the customer service representative a second time about the phantom cellspot fee on my last bill. The representative said looking back on their history the cellspot was processed back in 2015 which was about 9 years ago to one of an old downline number and that was all that was documented. As the main account owner, I had never authorized, ordered or received a cellspot from Tmobile. Additionally, none of my downline had any collection of ordering or receiving Tmobile cellspot. The rep said he couldn't dispute the fee and asked me to pay for this phantom charge. I refused to pay for the cellspot scam that I had never ordered or received, but because my husband's credit card is still on file, Tmobile automatically charged his credit card for this bill. Tmobile also sent this bill over to collection after the charged. I am so disappointed at Tmobile and their cellspot scam. Who do I report this to, how do I get my refund, and how do I get this resolved?