We are mere humble servants of the UA computer. If the fax says "Confirmed Business Class" and shows your seat allocation thank the great God United, and you need not to know any more.
The airline has no clue any of this was discussed on FT. If they fax you that the confirmed seat is yours, and they have extracted payment for a coach ticket AND an upgrade, let them sort the mess out.
That is why once again I **ALWAYS** insist on a fax.
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~ Glen ~