Why does TM Home Internet not qualify for free Paramount + account?

I called tmobile for 5g internet and I was promised free paramount+ for a year when I signed up.  I do not have a t-mobile wireless phone.   I tried to sign up for it and was denied because I did not have a qualifying wireless plan.

I called customer service and said I do not qualify.   I explained to them I was promised it when I called in.  I said T-mobile is promising things they cannot deliver.   I asked they open a problem report for the script when order 5g internet.   She said she does not have a script.  I said the call center to request 5G has a script because they did not pull paramount+ out of thin air.   So I got no where.   Might as well be offering a free boat when signing up for 5g.