Dear {Recipient},
Thank you so much for your advice on {matter}. Your input is always appreciated, you never sugarcoat things and always tell me what I need to hear, not what I want to hear.
Anyway, I did as you said, and {how advice helped}. Thanks again for taking the time to discuss the matter with me. I can always count on you for guidance and support.
Warm regards,
{Your Name}