I too was raging Marydoll, checked into my app and I was "WHAAAAT" pretty much all the points just gone
There wasn't really anything in their FAQ that dealt with the problem of the problem of points being used fraudulently, just the "lost or stolen card" which wasn't the issue. The support team were super helpful, I'm guessing that Nectar have outsourced all of that to India, because the three guys in differing departments all had that intonation which can be difficult to understand, not a criticism, just a fact. I hate having to ask them to repeat themselves, they're probably used to it. The last one who I spoke to was patience personified, I wouldn't want to be dealing with me, I'm a bit dense with anything technical, but we got there.
That sounds really off Indigo, maybe ring the Nectar helpline.