public void AddUtilityAccount(UtilityAccount utilityAccount)
        {
            if (utilityAccounts.Contains(utilityAccount))
            {
                throw new Exception("Duplication or something... I don't know! Skrew you!");
            }

            utilityAccounts.Add(utilityAccount);
        }
        public static void AddUtilityAcountToCustomer(string customerId, UtilityAccount utilityAccount)
        {
            var customer = GetCustomerByIDFromRealDB(customerId);

            customer.AddUtilityAccount(utilityAccount);
        }