function getAccountBill() {
    const accountBill = `2222${Math.floor(
      Math.random() * 90000000000000000000,
    ) + 10000000000000000000}`;

    Bill.findOne({
      where: {
        account_bill: accountBill,
      },
    })
      .then(isAccountBill => {
        if (!isAccountBill) {
          getAccountBill();
        }
        return accountBill;
      })
      .catch(err => {
        /* just ignore */
      });
  }