Quickbooks makes a mess of my chart of accounts

I set up a new company in Quickbooks online about a week ago. To my surprise when I started, my chart of accounts only contained about six accounts. I called support, because I thought this was not right. The lady unhelpfully suggested that I should add the accounts I need manually. I spent the weekend designing a chart of accounts and manually adding about 100 accounts to QBO. A few days later, to my surprise Quickbooks automatically decides to add another chart of accounts on top of the existing chart of accounts. Now I am nearly maxed out on the number of accounts I have. I want to delete these accounts because they serve no purpose, but I can't even though none of them have any transactions in them. How do I get rid of these surplus accounts. Do I need to erase the company and start over?