How long will it take to get my father’s refund

(Edited per community guidelines) my father is 80 years old, his memory isn’t good at all!! A little over a year ago he wanted to get direcTV so they came to hook up connection but where my father live it wasn’t any so my father thought they could close out the account. THEY DIDN’T!! For over a year now they’ve been taking $180 a month out his bank account, I took over my father’s afar. That’s how I found out they had been taking money, last month in April I called to see what’s was goin on. They I spoke to told me my father wasn’t getting any of his money back even tho is shows he’s never used the account, that’s over $2000. So I said cut the account off so they want take any more money out his account, the guy tells me they are still goin to charge my father the next month but will cut off service. Today May 29th I check my father’s account again & more money has been taken out so I on the phone with someone now while I’m writing this. The person I’m on the phone with now is VERY helpful & I’m thankful for him but he said he can only give back four months of the money they STOLE out his account. I think I’m goin to have to sue them for the rest of the money. So the refund he gets back is $900 but they STOLE over $2000!! When will the $900 be in the bank? & if anyone can help or give ideas on how to get the rest of the money back it would help a lot or I will just sue