Swap old wired receiver for wireless receiver - DirecTV

I've been a Uverse, Internet, Phone customer forever, AT&Tmobile wireless customer for longer. I have a wired DVR in addition to 2 additional wired receivers. I like to swap 1 receiver (pic attached) for a wirless receiver. I'm quite competent to self install and do not want to incur installation charges or monthly recurring charges. I wasn't aware there was a customer "retention" office. Specific contact information would be very appreciated. Thanks

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