How to reach T-Force ?

I was on the phone with T-Mobile prepaid,  I spoke to Maria about a payment that was requested but was not due in fact she had a 70 credit. My mom was told to pay $50 when she had a 70 credit. My mom is -   older and made the payment. The next day which is today I call prepay to find out why $50.00 was requested when no outstanding payment was due. My Mom is 81 years old I opened this T-Mobile account for her. When I asked for a refund of the payment Maria in the Philippians stated she could only refund 50.00 of the payment amount.  to get a refund of The $4,45 I would have to contact my government. I requested to speak with a supervisor I held for 15-20 minutes a supervisor she brought to the line said I would in fact have to contact my government for the $4.45. I asked which department of the government I should contact and requested she give me the different government departments who  I should go to for a refund and she disconnected the call. Did you know this was going on reps are referring customers to the government for a refund of taxes. What a horrible experience to have with offshore reps who seems to have little or no respect. shocked I'm sure the trainer is not aware this is happening if true which government office should we be calling when there is a refund surcharges & taxes