Product: Credit card

We stored our RV at a storage company XXXX in XXXX 2015. I spoke with the agent there and told her that I was paying for 2 months and asked her how much the fee was. I was in XXXX, my son was there XXXX with the RV. She told me that the fee was XXXX or XXXX a month. I told her that I was just paying for 2 months. She said fine. My son took the RV out in XXXX. Then 2 months ago I noticed the charge of {$50.00} was on my card, then {$60.00} since then. My son called them and I called them for 2 weeks with our name and last XXXX digits of credit card for them to stop charging and take off those charges. They would NEVER call us back. I then called my credit card company Sam 's Club XXXX, Synchrony Bank and told them. They said they would do a dispute and in the meantime that I should cancel the card so they would not get any more charges on it. And that they would send me a new card. I received an email to be sure and re-activate my card, but I did not receive the card, so I called them back and after 2 hours of waiting and being sent from dept to dept they said that they had finally found my records and that they would continue with the dispute. I was charged an additional XXXX in this time that my card was cancelled and it was applied to my card.. I told the credit card company that they said it would not be charged again. I then received a letter yesterday saying that the " vender would only take off XXXX. I then called the credit card company today to say that was not acceptable, because they themselves told me to cancel my card, saying it was stolen, then they would re-issue a new card. They told me to do this. The card was charged again and then again I spoke to a manager of Sychrony Bank today, XXXX ( male ) at XXXX to re-open the dispute. He told me that companies can still charge even if you cancel a card. I told him that his company told me to do that. He said I did not have proof that I was not there. I told him that the RV is in my driveway now XXXX and that I could make a movie with him listening and he would know. And that I could come up with someone to sign that the RV is not there. He said that that would not do and that he could do nothing more for me. I asked for my records of the dispute and he started telling me to stop interrupting him or he could not talk to help me. I would listen and all he would say is that they could do nothing more. I told him that I have been an excellent customer and that he could not take my word for this and look at my records and see what I have tried to do? Why would I call them if I was there XXXX and my Rv was there and I was telling them it was not? The Sams Club XXXX XXXX credit company of Sychrony Bank only sent them a paper to fill out. They did not even call them. The Storage company will not even return my calls. 
I do not know what I can do. My son took out the RV after 2 months like we told them. The RV was not there. This was in XXXX 2015. I have to cancel my card for good, that is all I can do, and how is this going to affect my credit? If I leave the card alone, Sychrony Bank will just keep taking the charge. I have left XXXX messages with XXXX Storage and they have not called as of today.