How do I get a copy of my phone conversation with T-Mobile?

I just experienced the same.  T-Mobile promised a very enticing bundle deal that had me leaving AT&T after 20 years.  Then they were backpeddling on follow up phone calls.  Nobody seems to be able to provide me copies of the recorded calls with their salespersons, nor a way to retrieve them.  They've lied and misled me several times and have not been able to get it resolved with their original promises. 
 

They were supposed to save me money which is why I left my other carriers and now I’m paying more because they went back on their words.

Anyone else?