The definition I prefer is that a cold call is one that is not requested, I did not ask them to call me, nor did I ask them to call me and be arsey when I refuse to answer their questions. So yes it was a cold call.
You're free to call it whatever you want, but that doesn't make it a cold call.
If you want to stop them calling you, register here:-
TPS RegistrationWait 28 days, and then tell them specifically that you object to them calling you for marketing purposes:-
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Organisations with which you have an ongoing relationship, for example those who regard you as a customer, (or in the case of charities - a donor) may well gather your consent during the early stages of your relationship with them and will therefore be entitled to call you even if your number is registered on TPS, unless you have previously told them specifically that you object to them calling you for marketing purposes.
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But note:-
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As TPS registration only prevents marketing calls, organisations will still be able to call you for the purposes of genuine market research.
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Complaining again and again may stop them calling you, but they are under no obligation to stop.