I had it and bled for 6 months. My dr kept saying it will pass. I did this for another 6 months. Sometimes a liner would work, but my period was like yours, very heavy. I just couldn't handle the bleeding, no matter if it was light anymore so I took mine out. Mirena worked better for me in the end. It didnt stop my periods, but there was a break!
Maybe give yours some extra time maybe it will work for you. Otherwise, try something else. I wish you all the best!