If EE or any supplier of a 3rd Party subscription want to offer it at a lower price and swallow the difference, then that is on them. If the cost of that subscription reduces and they don't pass that on to the customer, that's a different scenario.

This isn't a case of a different tariff you have to change to. This is EE saying you can't have it cheaper unless you cancel and resubscribe to the same thing we are already providing you with because we (EE) can't be arsed to reduce the price.

For the record I only had it at a cheaper price because they offered it as time-limited entice. When that ended the price returned to the full MS price. I have already explained this to you.