Furious

I purchased an Apple Watch at Best Buy .com for same day pick up to add to my att service. The people at Best Buy could not get the watch to scan so they canceled the sale. After they tried for an hour longer I said forget the watch and left frustrated. A week later I noticed 2 strange numbers being charged on my plan , then a week after that the full cost of a watch appeared. I have called AT&T and they keep telling me it willl fall off in 24 hours....that was 2 weeks ago and about 4 times since then. I haven’t been able to calculate my bill for about 2 months now because all these bogus charges still remain. Best Buy called and explained the situation but no one at ATT has been able to help AT ALL. This is my last effort before I enter arbitration with ATT and get paid double for my lawyer and get paid for the hours of my life your mistake has cost me! Is there anyone that can actually accomplish anything at ATT