We have similar Costus speciosus in Ginger or Zingiberaceae family with drowning big White flowers. They are at peak in flowering here in India. I will post in few days their spotting.
I don't think it's in the Convolvulaceae family.It's hard to tell from the photo but this is not a vine. The bud underneath the flower resembles the bud of a ginger or costus.
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