Hello
The email that you have received is about the annual price rise that all customer that have a service will not be increased, but that doesn't apply to the rise when your discounts come to an end.
The part "That’s why, even though your minimum term or introductory discount is coming to an end this year, you won’t see any other price rise in 2020" this basically means that you will have your introductory end of minimum period increase but not the RPI increase.
Regards Mike
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