Hello, does sinsot (dowry) still happens in Thailand, even among the modern Thai women?

Just a few questions...

My Thai fiancé has told me the sin sot might he 500,000.

Later I was told it is 300,000.

Next it was 200,000.

But I should have another 100,000 just in case.

I have purchased a gold engagement gift a (ring and a bracelet).

Several days later I was told I also need to buy a necklace.

To me something just doesn’t feel right, am I being manipulated, or am I over reacting.