Upstox customer care responds very quickly to our queries whether you mail them or you call them. you can ask them anything from demat account details, amc charges, any sort o bills, brokerages, margins etc. they solve your issue as soon as possible and always give you the proof or documents that you asked them for. they never get frustrated and solve your queries as many times you ask them. they even call you back afterwards if they want some time to resolve your problem.