How to call 1800 india number from USA

the number i want to dial are these two

1. 1800 309 3333

2. 1860 500 8888

these are a health insurance customer service number. I have international coverage from them and now i simply cant get in touch with them.

I have a Google voice app with enough credit.

I tried 001 91

I tried +91

I also tried removing 1 from 1 800

any help would be appreciated.

I m willing to change the app as well if anyone has any suggestions