HDFC Bank — Hold Amount of Rs.1020 due to credit card

Address:

KBT-99, Phase-3, Kabir Nagar Raipur

Dear Sir/ Mam,
i have hdfc credit card limit is 12, 000 i have used 8000 and due to covid i am unable to pay the bill of my credit card after that on 29-June my account get hold of rs. 1020, without any message i have send mail to hdfc but its faild due to wrong address, my consign is that if my credit card min bill amount is hold by the hdfc so why its not credited to my account, why its show hold, so i want to compaint for hdfc bank why my amount is hold or if it is hold so why its not crediit to my crdit card.
kinly check and do the need full as soon as possible