Severe Billing Question

Just wanted to join in the party. In the same boat as everyone else. Was reviewing my cc statement and discovered I had double charges for the past 2 years + . Like everyone else I reluctantly went through the chat 'customer support'. Send CC statements and basically ran into a brick wall. They closed my claim after telling me there were no double charges on their end despite having the credit card receipts. I was incensed. I opened the claim back up and it turned out on a second look I had 2 accounts  under different email addresses. Not sure how this happened. Possibly I changed the email address on my account and inadvertently added an account. Not that Dropbox is going to try and help me discover what happened. Same name, same credit card and yet no heads up from Dropbox when that transaction was occurring. They offered to cancel the second account and generously granted an "extraordinary" refund of 5 months ( approx $60) for a double billing fiasco that lasted over 2 years (at least $200). How is this fair? The lack of a customer support phone number is beyond annoying.