I don't think that "whoop-di-doo" is impolite, but when you had repeatedly said that politeness had worked for you when I had repeatedly said it hadn't for me I will admit to a degree of irritation. I am sincerely happy for you if your calls have stopped. One theory for that may be that your politeness has somehow overridden the call centre lists and worked a charm. I see no reason, however, why telling a caller their call is unwelcome, inappropriate or otherwise a nuisance shouldn't work as well as politeness. Another theory for your ceased calls is that they've moved on to other methods of marketing.
I have, as I admitted in a post above, done some shifts for a telephone calling business. We were calling people whose names were on a list because they had previously donated to the charity or cause in whose name we were calling (it was an ethical company who only called for charities or political parties the management agreed with), or because they were members of the organisation concerned. We always took account of whether the person we were calling was willing and prepared to talk to us ("is this a good time to call?") and made notes to ensure they weren't called again by another caller from the centre. Most of the people we called were perfectly happy to be called - a few were not. None were unpleasant that I remember. However when it went badly wrong was one list we had to work from which came from a medical charity and we found that call after call was being made to households where there was a recent bereavement - the list, it turned out, had come from people who had made a donation to the charity instead of sending flowers to the funeral. Again, no one was unpleasant but we all had to stop after three or four calls in which the levels of grief were unbearable.
My experience tells me that most of the calls we're receiving are coming from lists which have been sold on and sold on again, which is why it can be virtually impossible to stop the calls coming. The callers don't realise the lists are very out of date. In the case of our nuisance calls, I suspect there has been a typo along the line and our number has been put on the list instead of whoever it was meant to be. So it makes no odds whether I am polite or not - some other person in some other call centre has the list which has been passed on to them. The only mystery is why the caller doesn't actually try to persuade me instead of the mysterious Mrs Clements to buy whatever they're selling.