Product: Debt collection

I received an email from a debt collection agency named Hunter Warfield XX/XX/2024 from the email address ConsumerEmail@hunterwarfield.com. I called that day and was not given a pin number to file a dispute. I called and spoke to a representative to discuss the dispute and the customer service representative was extremely combative, antagonistic, unprofessional and rude. So much so, that I asked to speak to a supervisor, but the person refused to transfer my call and was saying my debt was accurate without trying to help me. It was unbelievable to say the least. I responded to the email that was sent to me to get a pin number to file a dispute since it was impossible with their customer service. 
They responded XX/XX/XXXX with my pin number and kept sending emails that they would respond to my dispute, when I hadn't filed one yet, and I kept responding via email stating that. I submitted my dispute the morning of XX/XX/XXXX. It was a lengthy email with eight attachments showing that the charges were fraudulent cleaning charges and HVAC charges that by law they couldn't charge me. I received an email XX/XX/XXXX stating that " I didn't provide enough information. '' I responded asking them if it was another faulty email because I sent over four long paragraphs and eight attachments of documents and pictures. They responded XX/XX/XXXX " Thank you for contacting Hunter Warfield regarding account number XXXX We apologize for the previous communication as have received your input and our investigation is ongoing. We need additional time complete the process. As soon as we have a response from the creditor, we will complete our investigation and promptly forward our response and any applicable documentation to your attention. 
If you have any questions, please feel free to contact our office at XXXX. Hours of operation M-F XXXX EST. We look forward to helping you resolve this. '' I hadn't heard anything back and followed up via email and calls. When I called from my number it continued to ring and go to voicemail. I emailed them XX/XX/XXXX to follow up as I hadn ; t heard anything regarding my dispute investigation. I received a very confusing and disturbing email today XX/XX/XXXX. " We hope you are having an excellent day and wish you the best on your daily activities. 

Our office is in receipt of your email of dispute and request for verification. However, our records indicate we have previously provided you with validation of the debt. Under the FDCPA, there is no duty to provide verification multiple times or to provide verification after the 30-day validation period under 1692g has expired. As we have previously fulfilled our duty to provide you with verification, we do not plan to respond to any additional requests at this time. Please review your spam folder. 
If you have any questions, please feel free to contact our office at XXXX. Hours of operation M-F XXXX EST. '' This company has NOT provided any verification, outcome response or communication. As I stated to them in my response their emails ALWAYS come to my inbox, but I check both my spam and inbox multiple times a day. It's already enough that I've been scammed by XXXX XXXX, now their debt collector is trying to scam me. I really need some intervention as this is fraudulent, unfair and I don't know what to do.Please help me.