KeyBank NA Bank Account Or Service Complaint

KeyBank NA Bank account or service department,

Checking account Account opening, closing, or management New York

we called key bank about opening a new checking account and to see about incentives for opening an account. we were told there was a $200.00 incentive but we had to do it online and was given no other information. we did the account on line and did n't enter a promotional code because we were not given one. the bank is refusing to honor the word of one of their employees and ca n't go back and get the information from the phone call because they deleted it. we only opened that account with that bank because of the promotion and they are refusing to honor it because they do n't have the information from the phone call we made. - from corporate office told me no and that was the reason. So now we are filing complaints and want what was promised to us. They continually lie to us about this