Dual SIM slot problem - Samsung Galaxy S7 Edge Questions and Answers

Hello Forum,
I bought this Samsung galaxy s7 Edge in India in 2016. When I pre-ordered it, they (Samsung) asked me a sim card number, so I gave my Vodafone India number. They said, when I receive my order, I should put this Vodafone India SIM in slot-1 for 7 days, and then I can change it to whatever I want to. It worked. I can now put any SIM (except Vodafone) in any slot (1 or 2) and it works.
The problem arises when I put back Vodafone India SIM in the phone, I have to put that in slot-1. If I put that in slot-2, I can't make outgoing calls, can't access data, can't send text messages. However, I can receive calls.
So I'm wondering what is wrong? As usual, Vodafone customer care is useless and so is Samsung. Both are pushing on others. It's frustrating...
In summary, my pre-registered Vodafone SIM only works in Slot-1 and I want it to work in slot-2.
Could anyone here please help me?
Thanks,
p2kin

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