Need help understanding a recent order !!

My agreement ends on April 14th.  I called about 10 days ago to see what I could do because I didn't want my bill to go up with my agreement ending. I was told to wait till April 7th and there would be a better deal. I talked to a nice lady that said her name was Estella. I said thank you and do I call you. Estella said no she would call me. So around 5PM I called to try and find Estella. Got someone else that said he could handle everything. Told him I wanted a price of the exact plan I have currently. He placed me on hold and came back with a price which was exactly what I have now. I confirmed again it had all the same channels and Internet speed I currently have. He said it is exactly the same. He sent me an email to confirm service and asked me to click on and confirm the agreement. I do and later receive an email that says my Fast Internet was cancelled and instead of having a 400 mbps download it says I have an 80 mbps. download plan. I have been on  peer to peer messaging and sent this question for someone to check into this as well as this forum. I would appreciate someone looking into this. I have no idea how this slower download speed will affect my service. There was no doubt that I was asking for the same exact plan I have currently and just want to tell someone before it changed and it doesn't work for us