Accor is well known for their very poor unempowered customer service, which seems to expect customer to simply forget/forgive so Accor does not have to compensate for anything.
In my experience, as yours, Accor when pushed long, hard and tediously enough may give you 4,000 points, which tops 80 Euro, though these points are not valid for some of their best rates, such as special promos.
Conclusion: if you are persistent you may get something... which, in the end, may not be enough for all the hassle, yet again..