U-Haul Overcharged Me $450 for a Moving Truck and Refused to Explain the Fees

Based on my reservation, I just booked a moving truck from U-Haul hoping to pay the confirmed amount of $150. I was surprised to find my credit card charged $450—three times the original quotation after returning the truck on time with a full tank. Uncertain, I called U-Haul's customer support right away thinking it was a billing issue that would be corrected right away. Rather, I encountered ambiguous answers alleging "additional fees" without clearly breaking out the breakdown. Weeks have gone by and despite several calls and emails, I still haven't gotten a refund or a clear justification. This encounter feels like a purposeful overcharge strategy and has been rather frustrating. U-Haul has to drastically increase the openness and billing policies.