Hello everyone! I'm here to offer my services as a developer. I will make you a customer management system, according to your needs, which will make your life mutch easier. Everyone knows how hard and boring it is to modify excel files when something happens. Why to do so, when everything can be smooth and easy? Your system can be desktop based or web based, it can be made for windows, linux, or mac - android will also be ok, but it will be more costly. The price may vary, based on your requirements. Usually it is between $150-300 (again, it depends on your requirements). Also your system is comming with 2 months of free support! So, if you need such a system, or if you have any question, don't mind to reply here or to start a conversation.