SIM NOT SUPPORTED FOR MY CONNECTED CAR ????????

i have a range rover 2021 

when i purchased the car came with a simcard for connected car from att 

after the trial data plan expired i did not renew or add more data to it 

it got canceled 

i still have the sim and it still in the sim slot of the car since then never taken out of the slot 

now i purchased an unlimited plan for 12 months from att and tried to activate the plan to use it 

it kept showing sim not supported when i tried to enable the MOBILE DATA setting on my car 

i can still connect the car to my wifi 

but wont be able to turn on the MOBILE DATA 

i called ATT 4 times and they told me to call LAND ROVER

i called LAND ROVER about 7 times and 4 times of the 7 they told me to call ATT 

i got stuck in the middle and have no clue who to call to get help with this ?!?!?!?!?!?

i think the one i should call is MY MOM and tell her all about this so she will give me the best answer as always.