Fraud and harassment.....please help....

I was persuaded into the Mobile phone number I have because there was a deal that would it include my Internet as well as give me a phone for free and due to the poor customer service representative I received I have been over charged for 4 months. I've been dealing with a domestic violence situation and was just granted access to my bank account again after months and realizing that I was over charged but even after I was told it would be taken care of and I would be refunded I was hit on by the employee and then told me there is NOTHING that they will do. I don't understand what I did wrong when it is on record that 2 different Xfinity team members told me I would pay a certain amount and was charged almost triple the amount and now I'm being told to eat it plus the phone cost which I was told was included to begin with. I don't think the employees telling me the truth about the situation, I'm not giving up on this, can someone please let me know how to rectify the situation.... I have enough stuff going on, I thought I could at least count on Xfinity to follow through.. I also believe I was effected by the Xfinity breach and they will not tell me who to contact for that. I can't believe this is how this store is going about things. Please, help me!!