Swiggy — 1000% more cost for item, changed the price at logout

Address:

Chennai

I had ordered many vegetables in the morning of 12th June.

While paying, they changed the price twice mentioning stock of two items. After removing non available stick it gone to payment and it got delivered also.

While checking the bill, we noticed that the cost of 2pcs of drumstick is 229. In market 2pcs of drumstick will be less than 20.
I had highlighted to the customer care of swiggy, they say that they will avoid such error in future and refused to return my money