bank nifty view for 28 july

bank nifty closed below 22000. now if it go below 21800 next target will be 21600 and 21500.
21500 is very strong support and 22000 very strong resistance.
there is a trend line in daily chart. so bank nifty can take support here or 21500 level.
for buy side we can buy if b n start tread above 22000 for target of 22200.