So back in 2014/15 i bought some BTC and had a wallet on the old blockchain.info site. I had used a few coins to purchase "stuff" and had some change left over which back then wasn't much so was quickly forgotten although i always knew i had saved the 21 word recovery mnemonic on a hard drive somewhere somewhere....
2-3 years ago i remembered i still had these coins which become worth a few thousand dollars so i thought i should find them again....
2 years later till today and sifting through 7 hard drives and billions of files i finally found the 21 word recovery mnemonic. I keyed the words in and i was given a link to my wallet id and the password but then when i attempted to log in it said "authorization required, check email".... back in those days 2fa was disabled by default,  i used temporary email addresses to create the wallet and was never required to authorize logins via email nor was a phone number registered.  There also wasn't  silver or gold memberships as today. 
So i emailed support and the response i got was that i should use my 12 word,  not 21 word, recovery phrase and reset 2fa.... but this makes no sense as i had used my original 21 word phrase and recovered my login credentials but the damn thing still won't let me in.  What was the point of having such recovery mnemonic and how the hell am i gonna get around this email authorization??
The wallet is worth $30k+ and times are tough, can anyone make sense of this and know a solution?