I agree, @Leanne_T , the Help page looks to be the correct 1.
The MyEE page even contradicts itself within itself. It starts off stating your Boosts will change when you move between pack types but then ends on saying that when you do your Boosts will remain as previously earned.
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband
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