At different companies? She has a very squeaky, almost babyish voice with a sort of Canadian accent but not quite. Like a kindergarten teacher with Canadian English as a second language. Shes very polite and friendly, never gets annoyed but can be very hard to understand. She works for Asda, HSBC, Next, Sky and many more I've probably forgotten.
Are call centres using voice coaches or some sort of software to change the voice? I've never met anyone in real life with that accent but they all seem to be at the end of the phone.