I'm confused by the statement that the connector doesn't fit. Some people get confused by something like a terminator on the end of the cable. (If so, you just unscrew it to remove it.) As mentioned, maybe you can post a picture of what doesn't fit?
Honestly thats beyond my abilities, I've already watched youtube videos and did all of the research I could. With this stay-at-home order implemented Its hard to get out to go and get everything I need considering all of the crowd thats rushing to get every single thing they can. Do you know if the technicians can come into the house if nobody is here, or are they just not allowed to in general?
Another option would be to call around your local area for a low voltage electrician. You may be able to find one that is willing to do it for you. Good luck !