I publish at Amazon and I am sorry you have had such a terrible experience. It is always something I have been concerned about. I am about to publish another book, but this time I have my own ISBN and will publish to other platforms too.
I hope that you do eventually get help with this at Amazon.
None of us should put all of our eggs in one basket. It's a hard lesson to learn in this way. There are plenty more platforms to choose from, as the other commentators here have mentioned.
Keep going Ranuka, definitely never give up. Life can be a roller coaster that's for sure! Things will get better again.
All power to you!
Petra