Unsatisfactory service and advice

Both my decoders intermittently gave ‘There is no signal E48-32’ error displays and image break-ups. ’TV + Video Doctor’ sent a guy who replaced the Dish & LNB (old), resulting in a small improvement (citing old decoders). The guy returned, ‘fine-tuning’ the signal further - a minor difference. A second guy was sent on request, he fiddled a bit behind the decoders, then we lost basically all signal - snowy screen with the image barely visible (saying both decoders packed up. He quoted two Explora Ultras (unnecessary because we had a Wi-Fi ****le) @R5,000 and an HDMI selector @R3,500. I got the two decoders tested at ‘Aerial & Satellite Excellence’ - worked perfectly! They sent a guy out, he worked for about an hour on the cabling behind the decoders and then perfect images appear from both decoders! Be careful before accepting advice from some technical support people.