Flash Cash — harassment calls to me and my contacts

Hi this is in regards to harassment calls i am getting from flash cash loan company, its not only me who is getting these calls however these people are also making calls to my contacts as they have all the contacts of mine, i already requested them not to call any one also i requested them to give me some time to pay you as this is a lockdown period going on but these people are not ready to listen anything and harassing me by saying that they will leep on calling your contact and you have to pay today. Please someone help me