Consultant misled me!

So i owe virgin active and they handed my account to mbd, in an effort to settle the account i called mbd and the lady i spoke to advised i owe 2600 or so and if i want to settle the account i will get a 90% discount- great i pay the settlement amount. When i call a few days later to get a settlement letter they tell me whoever i spoke to “****” or misled me as i still owe whatever much. They advise they will escalate the matter to quality assurance to ensure i was indeed misled, whenever i call for an update they tell me the same thing (quality assurance will investigate) meaning nothing has been done and callcentre consultants i’m speaking to aren't doing what they say they’ll do.

At this point i’m annoyed, i cant be calling daily for an update and not get any sort of assistance.