Swastik Investments — Without details about brokerage

I am a swastika investment Demat account holder. I new to this brokrage company. First trade excuted through swastika dealer on dated 18 july 2022 for which they said to me your profit for today is Rs. 2000 but in my account amount credited is Rs. 52 Only. Next day on 19 july their dealer contact me and said today good opportunity seems in market and we can earn a good profit and he wants excute a bulk quanitiy of bank nifty option i asked whats is brokrage for per lot he said company mail to me at tonight. But he refuse to told me about exact amount of brokrage. After matket closed i got loss of around Rs. 2000. I think it is ok. But when we got contract not at night via mail i noticed rs. 13500 was deducted my account. Next day i talk with swastika officer and he said may be wrongly brokrage deduct. But at evening he said brokragr is correct. Initialy they do not told me about brokragr of per lot in bank nifty. They executed trade in lot of quantity to earn a more brokrage in per lot. It os not good way to without knowledge of customer they can do.
Regards
Anshu kuril
Ac no. HOS6305
Mob no. [protected]