how to leave a good customer service review?

After communicating with 5 T-Mobile representatives over-the-course of the last several weeks, today, I finally got some "positive" results.  Tiara, thank you.  Though my issue was not resolved to my satisfaction I am sure you did your best.

Issue: just over a year ago I found the opportunity to test the TMobile home internet service; however, the service would not connect in my area. Subsequently, I physically returned the item to the brick and mortar store located on Smallwood Drive in Waldorf, MD.  The representative accepted the device back into the inventory. I thought it was a done deal. But that is where the issue began. 

The representative failed to follow the established administrative procedures to make the request to discontinue service for my home internet service. Service that I unknowingly continued to pay for for more than a year.  When I discovered the additional item attached to my account I questioned it.  I was told that it was for my home internet service. I relayed that I have never had the service.  The representative checked the records and agreed that at no time had I ever connected to the home Internet service and that my unit had been returned in May '2022. Sir, they said you have been over charged by $700.00 and are due a refund.  Three reps later and I still had no refund. Two didn't annotated the conversation. Today, through Tiara's diligence she was able to get me a resolution.  Though TMobile owes me 700.00 they will only credit me 165.00 (three months of the over charged period). It was relayed to me that it was my fault that I had not check my monthly bill and discovered the issue earlier.  I say, it was their negligence for not following protocol for the turn-in procedure.  Of course, they win because they hold the cards because if I fail to pay my monthly bill in an attempt to recoup my fraudulently taken money they will suspend or cut off my services.  Even worse they would only credit my account instead of issuing me a check for the 165.00.  

Advice: scrutinize your bill because it is not their responsibility to treat a customer right by following their established protocols. 

As much as I like the service, I am about to look into Verizon or maybe consumer cellular.