Room for improvement with Accor’s pricing policy

I paid the ‘advanced saver rate’ online but later found my hotel was selling rooms cheaperLast November I used AccorHotels’ website to book a night at its Stratford-upon-Avon Mercure hotel at the end of this April. I paid upfront at the advance saver rate of £98.10. Last weekend I checked the website for directions, only to find that the rate had dropped to £71.10. I rang the hotel to ask them to refund the difference and was told that the manager would get back to