Bank manager is threatening the consumer for decreasing the CC limit in the account due to lack of transactions

Sir I am a customer to andhra bank I have made project of establishing one gram gold imitation jewellery in rajahmundry on main road. By taking a CC limit from that bank rs. 9,00,000/-Till now I am not a defaulter to the bank with regards to n.P.A. Now for the last two months bank manager approached me and threatening me daily by way of phone call that my transactions are not sufficient and hence he supposed to decrease the limit to rs. 00/- My explanation for the same is, it is just about six months that shop has been started for every business it will take normally 12 months to 16 months to reach the break even point. Please get me relief from this threatening