MIX Telematics don't understand

My insurance requires that I have my BEAME unit tested every 6 months. I phoned Mix Telematics on 17 December 2019 and Caroline assisted me. The test was done and my unit seemed to be functional. I asked Caroline for proof that the unit was functional and she said she would send me proof by email. I never received the proof and emailed them again and also requested help on their Facebook page. They then sent me my installation certificate, which is not what my insurance requires every 6 months. I need proof that the unit was tested on a specific date and that it was STILL working. I explained this to them on Facebook and email and they then ignored me. I still have no proof that the unit was working on 17 December 2019 and if my vehicle is now ******, my insurance won't pay out. Very disappointed with their lack of understanding and terrible service!