Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very Bad Customer Service from BigTrends

i bot the book and later subscribed to its Bigtrends newsltter service and i had the worst experience ever in my whole trading career. I wrote to them several times for problems i had in its service and i received no replies. They charged me upfront for thousands of dollars and no refund despite cancellations after two weeks.This is one newsletter that i would not recommend...trust me ! there is no customer service at all !!