Jhbgirl - 'a verbal agreement isnt worth the paper its written on', or some variation of that saying. So unless they put something to you in writing, and you replied in writing, there's no legal evidence that you declined anything.
Furthermore, although calls TO the support centre are clearly stated as being recorded, I dont think its admissable in a court of law, if they were to be recording a call made BY them to YOU - (without them advising you at the start of the phone call that they were in fact recording.)
So it doesnt matter, I think, whether or not you declined it in a call made to YOU - it becomes a 'your word against their's' situation, and totally inadmissable in any legal and binding way.
Thats my devious take on it
Also, I think when calling the Accounts department, (or any Department)and getting the names of people you speak to, ask for their email addresses, and send them mails which begin with variations of the following sentence:
" Re Our Telephone Conversation - Just to put on the matters discussed on record, and ensure my understanding of the telephonic discussion I had with you (date/time), you stated the following: "
(then put in the substantive points they made, or the offers, the statements etc etc)
ask them to please correct any errors that you may have inadvertently made in the detailing of the conversation with them - and end it with the fact that you're looking forward to hearing from them.
Print this out, and maybe follow it up with a further fone call to double check, (and if you want to be really anal, send them another one saying 'this is to confirm our telephone conversation where you agreed that my recollection of the earlier conversation, was accurate'
and store this as well..)
so that there is a detailed record on your side and theirs, of any offers, statements or excuses given - and it also demonstrates that you are taking this as seriously as any other kind of business arrangement.
If one doesnt do this, it doesnt exist, legally speaking, and shows them that they can do anything they want, because you are not approaching them in a standard businesslike way..