How to increase the Sum Insured of my Travel Insurance?

[Vipul]

My father has multiple trip overseas travel insurance for amount of $ 50,000, which is valid till 31 Jan 2017. My father would like to increase the Sum Insured from $ 50,000 to $ 150,000. Could you please share the process for the same. Or do I need to buy an new travel insurance plan?

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