Get help from the internet
You can use the internet for any kind of help. Internet is a good platform where you can get involved with many people and websites which will certainly give you detailed help on any topic. You can also use the internet to get more information and help. Not only you will get positive help from the internet but you can also get information which will give all types of guidelines. Internet will also help you in other ways which will be a proper guideline.
Courteous language will give a very polite impression about your attitude and behaviour as to why you are declining to refund money. The reader will fully understand as your company policies do not allow a refund of cash.
A brief statement will also explain why you are not going to refund money. It is very important that you choose the right words and explain all the things which are required.
Proofreading is very important as it will give a very good impression on the reader. You should always read it again and be careful writing anything about your company.