Say if there is connection/activation fee

I am battling to understand why you claim there is no activation or connection fee yet you are going to charge me the proratq plus the full month’s fee on month one then still be expected to pay the very next month going forward. Why then charge me twice (essentially) for the first month. I then ask the sales guy what would have happened if the activation was going to be made on the 1st of the month, he cant answer what prorata would have been there