First and foremost, if we wanna control this call money rate hike, we should centralize the whole credit system to central bank. But actually this thing is quite difficult and inadequate for this time, to be honest. So, for resolving this dispute, again, central bank should be given the authority in the call money sector.
Now in this sector, if central bank sees that, the rate of call money interest is high, it should detect the banks who are rendering credit at a higher scale 'unnecessarily' and punish them by increasing bank rate of that bank or increase Cash Reserve Ratio and Statutory Liquidity Ratio of that bank so that it'd not be able to give credits to its clients. For the affected banks, the central bank should flex bank rate so that they can survive the problem. Moreover a law should be enforced to margin call money, like- generally bank rate of Bangladesh is 5-7%...