not quite - the charge is the amount listed in the price guide/listings. This is applicable for
all services (as stated in section 13 - "any services").
Any discounts given can be removed at the company discretion (if required or if necessary). Any and all discounts are classed as promotional as these are supplied for a limited time period, at company discretion or for certain sections such as students/local authority etc... The company is in no way obliged (legally or otherwise) to maintain an offer or discount as opposed to the full price that all other customers paid unless a contract has been signed clearly stating that this will be the case. There are however the terms & conditions that form the contract, and as stated above, discounts may be removed. [The people losing their discount will have been paying less than everyone else prior to the upgrade.... a lot of people would consider the fact that they are paying more for a service than others as unfair too! - consider this the opposite argument and the basis that it's impossible to keep everyone happy at all times].
Example - If you are subscribed to the Family digital TV package for £29.00 per month and 4 months into your contract this price increased to £32.00 per month,
then you may be able to use the price increase argument and request a cancellation of contract/services.
Whether this is a point you wish to argue or otherwise, discounts will be removed unfortunately. It would not be viable for a business to maintain discounts or offers for an unlimited period and to expect otherwise, i'm sorry, is unrealistic. All good things come to an end

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Head is swimming with flu at the moment so I hope this makes sense....

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also - here is the corresponding/connected 'definition' as stated in the terms & conditions.
"
Charges" means charges to be paid by you calculated according to the prices and rates set out in our Price Lists or otherwise notified to you;
"
Price Lists" means the material published by us from time to time which includes the prices and rates for the Services and Equipment we offer including the usage rates for the Services;