Capital One complaint: misinformation from every customer agent and bad behaviour from supervisor. don’t solved the problem and interest charge after do full payment

Iam really disappointed about capital one credit card. 3 months ago, i file for dispute for my one transanction 6 months ago. whatever documents they ask me i provide them but they said it’s not enough so i upload more documents always in letter they change the date and give me same answer provide more documents. so after 3 weeks i start calling customer service whatever they ask me to provide i provide all documents i used to stay with them line for 1 hour talking to them and upload all documents they asked me to send. after 4 months they send me letter they can’t do anything about my dispute because i didn’t submit this within a month which i inform them within a month after transaction. so i called customer service to closed my account she told me i will received my statement bill by mail i was waiting for that. after 1 month i see their online account they charge me interest and late fee. i called them up and pay my full bill. supervisor pickup call their she said if i paid full iam not going to responsible for any charge. next month i see they charge me again interest fee then i call them they said it’s their policy that’s why they charge me interest fee even though i paid on time before due date full amount and my account closed is well. they are scam people and disrespectful. every customer service represtatives every time give different kind of answer for same reason. big scammer be aware