SBI Cards at present is quoted at Rs. 590. When the market is in Normal situation, fundamental and technical calculations work and impact the scrip-trend. At present the market is passing through Fear phase when the logic is forgotten and meaningless selling emerge.
In such situation, it is difficult to predict, how much a scrip will fall. However considering SBI cards`s business and Balancesheet, long term investors may accumulate the scrip in small lots out of own funds.
Your Objective of buying Vodafone Idea must to earn quick gains, if the situation improves or solves.However due to Covid-19,the market is distress situation and Vodafone idea is in down trend. I believe the scrip will decline in coming days, till the situation is normal