Metro by T-Mobile review: Not receiving a prorated $72 refund from METROPCS

Me and my wife switched phone service from Metro Pcs to another phone cellular service. At the time of our monthly Automatic payment to Metro, we decided to switch to another cellular compnany and did so. A few days prior a $90 monthly payment was made around the time we switched services. However we have not received a prorated refund of about $72. We contacted a Metro rep and she said we would not be receiving that back. That seems illegal to me. We have tried to contact Metro Pcs to discuss this matter further but we are always disconnected from the line when calling by phone. If we don't receive the refund, I will contact The State of Maryland Attorney general's office and file a lawsuit to retrieve these funds. It's the principle of the thing I have never heard of someone not receiving a prorated refund before. And the inaccessibility of Metro's customer service is very disappointing