Zestmoney — My creditlimit frozen /freezed

Last 6 month I am not able to purchase amazon flipkart reliance some other merchant also, zest money Emi option not showing in merchant app/sites, I asked zest money customer service they say just set autopay, then after show in Emi option, I will do what they said I clear dues and set autopay, I try to purchase reliance digital almost finished showing emi option but unsuccessful payments, highly dissapointed, iam go to check zest money app credit limit frozen, why? I don't why frozen??