Product: Credit card

My name : XXXX XXXX XXXX XXXX. 
My address : XXXX XXXX XXXX XXXX , XXXX XXXX, CA XXXX. 
My contact # : XXXX It 's about my dispute with Citi Cards, billing dispute department, XXXX XXXX XXXX, SD XXXX . 

I 've signed the contract with XXXX XXXX to purchase XXXX XXXX weeks from XX/XX/XXXX to XX/XX/XXXX in XXXX on XX/XX/XXXX. That was my last day in XXXX and paid {$13000.00} by my XXXX Costco Card. 

When I came back home - California, I figured out that they put the wrong period of contract from XX/XX/XXXX to XX/XX/XXXX, so I tried to contact them. 
Their office in XXXX and I 've had to call them right away in XX/XX/XXXX. 
On XX/XX/XXXX, around XXXX, I called and talked with the manager, kindly requested them to change the date to my desired one, starting XX/XX/XXXX to XX/XX/XXXX. He promised to fix this problem but still now nothing happen. 
I called them again on XX/XX/XXXX in the morning around XXXX am, requested again but still, now I see no changes. I am not happy with their services. 
After that, the Citi card took over my XXXX XXXX card. 
I 'm so worried. Until now I have n't got any service from them and I had to pay for them {$13000.00}. So I made a dispute on this transaction. But they reversed the amount on XX/XX/XXXX. 
As that company is out of US and I felt so unsafe as they know my credit card number. That 's why I cancel my card on XX/XX/XXXX. 
Their company has sent me a lot of letters request my next payment even I did talk to their managers to fix their faults. 
On XX/XX/XXXX, I called in Citi 's customer service to make the payment, cancel the card and ask for helping to dispute this amount again. 
On XX/XX/XXXX, at XXXX. I called and talked to another manager to ask them to fix again, stop sending me the bills as I have never used their bad services. And he promised 1 more time, but still nothing happen. 
Otherway I tried to contact their by email, but I can not reach them. Attachments are the image of my emails In XX/XX/XXXX, their customer services called me and ask for another payment even though they did not do anything and I have never used their service. I explained my case again and they transferred me to the in charge person. Again, I explained, requested him help me to fix this problem and he promised again. 

On XX/XX/XXXX Citi card cancel my credit card without any notice and explain reasons. 
On XX/XX/XXXX, Citi Card sent me a letter to say that the merchant refuse to issue the amount I have previously paid as I signed the contract. And Citi card will bill me for the next 2 billing periods even though they cancel my account a month ago. 
As a customer, I have the right to dispute this transaction as these points below : 1. I 'm so distressed with the terrible customer service of XXXX XXXX. I do n't trust them anymore, I do n't want to use their service anymore. 
2. Until now I do not use their servces, I did sign the contract to purchase their weeks but it 's in next 5 years. 
3. I tried to contact them over 6 months for my case but no one get back to me and I see no change. 

To whom which may concern : 1. Please help me to dispute this transaction. 
2. Please give my case to the public media to notice to all of the customers be aware of the XXXX XXXX services Many thanks for your help. God bless you!