Thanks for your post and welcome to the forums. It's great having you on board with us in the Community.
Apologies to hear you are having an issue trying to access the My Offers page.
As you are getting an error on there, it's more than likely you do have a loyalty discount / welcome offer on your account. Most discounts come with a term that aren't allowed to be used in conjunction with another offer.
The My Offers page, bases the prices against what you pay now. If you go through with an offer, the discount gets taken off and you end up with a higher bill than you wanted or agreed to.
Give the team a call on 150 / 0345 454 1111 and they can take a look at things by going through your package to see what you have, what you want and what we can do to make it possible
Let us know how you get on.
Kath_F Forum Team
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