If your customer is seeking advice from you, here is a simple template you can use to write an advice letter to a customer.
Subject: Advice on [Entet Topic]
I am writing this to inform you that I received your letter seeking advice. I am more than obliged to know that you find me capable of advising you on [enter topic]. I have had a thorough look at the situation and would suggest you [enter advice].
I assure you that I studied the situation properly, and I advise you this with all my experience. I respect whatever decision you may take regarding my advice. I hope this helps you in resolving your situation.
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