Government gateway id

I registered for the gateway login,.passed ID only to be informed that I had another gateway account. I tried to reset password and login for the.old.account but my ID did not match. Helpline said to call hmrc technic support. Spent 1hr waiting and 45 minutes of again... failing the id check.... only for them to.say "I don't know, I'll check" and they hung up on me!! Any feedback on what I can do to resolve this? Really need the old.acct closed and remain with the new account that shows as active, now unable move forward on this as can't get an answer from hmrc. Any suggestion's?