Max Bupa — medical insurance policy #[protected]

My medical insurance, policy # [protected] was issued on 31 dec 2019 through policy bazaar, i have forgot to disclose my wife's surgery (Hysterectomy) which was happened in 15 july 2019, which has been highlighted by insurance company immediately after issuance, i have submitted the discharge summary on very next day i. E. 1st jan 2020, additional documents sent across on 9th jan 2020. I guess, the policy has free lookup period of 30 days from the issuance, max bupa has cancelled my policy on 18th feb 2020 and informed that refund is processed that too 50% of my first year's premium.
Now two things to be reviewed here.

Why maxbupa took so long time to review the document and cancel the policy? It would have been done during free look up period and associated.

The policy is cancelled on 18th feb 2020, not a single penny refund has been received till today i. E.. 26th april (68 days). I paid this amount using credit card, and interest is applicable, how come maxbupa can compensate the same.

My request for consideration.

Since the policy cancellation has been delayed by maxbupa why i need to give away 50% of my premium. So request my 100% refund.

Currently my policy is cancelled on 18th of feb 2020, the money is not refunded yet, so need the compensation for the delayed refund.

Regards
Chetan pisal