CBE harassment

This group has been calling me three times a day, starting at 8:05 am and continuing until after 8 p.m. After tenants ran up the gas bill and didn't pay it, the account was turned over to CBE because I missed a month's payment I made the next month's payment, but they continued to call. I told them I'd made a payment and they said okay, they'd stop calling, but they didn't. I talked to someone else and told HIM I'd paid. He said he's stop calling. Someone called again the very next day to see if I wanted automatic payments taken from my bank account and wanting to know when I'd be making the next payment. I told him this was the last time we would be talking with CBE group EVER and had my phone number changed to an unlisted number the very next day. Enough!! I'd had the previous number for nearly 20 years. That is how obnoxious this group is--they drove me nuts.