Consolidate 1 free acct to a paid unlimited

AVG Protection
1

in many past years, i have 1 free avg acct and 1 paid unlimited acct. 
i tried to consolidate into 1 acct. by using free avg email address, but it would not let me. 
how do i do it.

2

Hello Natcha,

Would you like to merge two accounts into single account?  We have sent you an email requesting more info. Please check and revert us to assist you further.

3

Hello Natcha,

Would you like to merge two accounts into single account?  We have sent you an email requesting more info. Please check and revert us to assist you further.