Found unexplained charge from TSP Travel during an end of the year credit card statement audit. Called TSP who initially denied any record of a transaction by me. When pressed by me with the fact I had a charge on my credit card with their name on it, the agent said they only had records 3 months back. I was calling nearly 8 months after the charge. They told me they would send my inquiry to their billing dept who would call me back They didn't.
I called repeatedly, each time talking to different person. They said they were a third party travel service to Expedia, they had no record of my transaction, and to call Expedia which I did. Expedia said they could not help and sent me back to TSP. Eventually, one honest agent at TSP gave me a record of the charge for a hotel I reserved then immediately cancelled the same day because I found a better deal. They had no record of my cancellation. I was able to demonstrate I never stayed at the hotel but despite that, they ultimately refused to cancel the charge.
Obviously I will watch my charges much closer. But, what is disturbing is that no less than 4 of their agents denied records of a transaction and in the face of proof that I never stayed at the hotel, they denied me a refund. My take home message: search for hotel availability using whatever travel service you want BUT ONLY book directly with the hotel, not a online travel service like Expedia. The hotel only charges you if you stay there or if you fail to cancel according to their policy.
TSP is a complete scam, poor customer service (except the one honest agent), and nothing but trouble. be forewarned!