Capital One Credit Card Complaint

Capital One Credit card department,

Billing statement Texas

I applied a Capitalone Venture One Credit card on - -, 2015. Before i applied, i chatted with Capital One 's online customer rep called - for detailed information and benefits of this card on - -, 2015. During the chat, - promised that I will first get - miles reward if I spend $1000.00 within 3 months and besides that another offer for - rewards miles if i spend at least $3000.00 within 3 months and he mentioned several times it is the benefits for Venture one credit card. Actually the link i used to apply for Venture One credit card was sent by - and he offered me this - bonus miles before I even asked for it. After the chat, I saved the chat history as a PDF proof. Now two months later, I have already spent more than $3000.00, and got the first offer of - miles in my account but still have n't seen the second offer for - miles so I contacted online customer rep to check if they can apply it. However, they refused the - rewards miles offer and said it was just a miscommunication and ignores my online chat history as the proof. I continued to talk with customer rep supervisor - but still got the same answer. I feel it is unfair that customer was told differently when tried to apply the card and after you got the card, Capital One changed their mind and refused to give you the original offer they provided, even though I have the proof of the original online chat offer history showing that I am eligible for the offer, so I would like to seek help to see anyone who can help me with this