I agree with you. Shame that the bonus wh*res and multi-accounters appear to have ruined it for you. Betfred actually has some quite good odds sometimes, though I understand you might not want to bet while you wait for the withdrawal.
Really, this is just a forum for other users, so if you want to follow up with SBR you should probably send a reply to the last e-mail you received from SBR.
Your case seems clear cut, you just want a pay out. Am I right in thinking it's been 3 weeks now since you requested the funds? If so, I guess a complaint to IBAS might be in order. If you want it all on record, you can e-mail them rather than call. Here's the online complaint form for them:
http://www.ibas-uk.com/adjudicationForm.php
As I understand it, a different company (presumably a wholly-owned subsidiary or similar, structured that way for tax purposes?) runs the website compared to the phone betting and shops in the UK. So it may well be that the guy you spoke to really did do his best, and it is just *that* disorganised.... though, obviously, it shouldn't be.
Hopefully a quick prod from IBAS will get your payout finalised.