Contacts out of control!!

Please help me!? I only have 79 actual contacts however my new iPhone 8 I bought a few months ago suddenly began stating that I have over 9,000 “contacts” when they are literally insane amount of duplicates of my 79. I have asked apple and at&t but have only been more frustrated due to their lack of professionalism, knowledge, and sense of customer service. I am a disabled combat veteran with extreme difficulty with technology and especially organization with the technology that I have. This issue is robbing my storage and memory on all my devices and is honestly not helping my health at all. I have tried everything and without any help from the professionals I even was prepared to purchase a whole new phone but they were going to charge me for ridiculous reasons and I had literally just bought the new phone through them. So please if anyone can please help me! Thank you very much.