How to escalate an reimbursement issue within AT&T DirectT

I am a previous DirectTV custoner. I moved and ordered AT&T Directtv service in October 2019. from the beginning I experienced ”775” and ”771” errors (loss of service). Numerours service calls to DirectTv resulted in many components being changed and the problem continued. I was then advised the issue may be the dish on my roof BUT the DirectTv service provider would not go on my roof to fix the DIRECTV dish because it exceeded their height limits. he gave me the name of another DirectTv service provider who would service YOUR DISH. the technician LEFT ME THE PART THAT HAD TO BE REPLACED ON THE DIRECTTV DISH. During numerous calls to the DirectTv contact number the issue was discussed, at tines for more than an hour, repeating what I was told. I WAS aTOLD THAT I WOULD BE REIMBURSD FOR THE SERVICE BY THE THIRD PARTY RECOMMENDED BY YOUR SERVICE PROVIDER. I PAID THE INVOICE ($552.36) AND CONTACTED DirectTv. Again, more than an hour on the phone only to be told I was ”misinformed by YOUR employee regarding reimbursement. The record of my call reflects the fact that TWICE i was told i would be reimbursed. Today, seeking the address where i would send the invoice and pictures that RESOLVED my 5 month problem i am told, today at 1:28PM, after 57 minutes on the call, that there was an error in communicaion TO me and I would NOT be reimbursed. The problem i had been having since installation WAS resolved when they replaced a cable to the dish that was shorting out

intermittentintermittently against a nail and a defective dish component.