Current Customers Pay Higher Bills

I am a current Business Internet Customer in my home because the residential internet packages do not provide enough upload speed to cover the large photography and game design projects my wife and I have to do for college. Nor is 10Mbps enough for our once a week work from home days via VPN. 

I signed up with the 2 year agreement last April for $249.99 per month for the Deluxe 250 Internet (250Mbps Down/25 Mbps Up).

Just about 1 year later I look and see that new customers can now get the same package for $139.95 per month (regular price listed as $199.95) or the upgraded 500Mbps/35Mbps at $199.95 per month (regular price listed as $249.95). So I call up to find out what can be done to lower my bill. I am willing to renew the contract and would even accept the regular price of the 250/25 internet I have now or keep paying what I am and get the upgraded speed of 500/35. 

They are unwilling to budge saying the Agreement (not a contract due to some legal differences) is for 2 years and my regular price is $349.95 so the $249.95 is a steal as it is $100 less. How can my regular price be different than someone else's regular price or the current listed regular price? That would be like going into Walmart and because I had been there before an item will cost me more money  than someone that is going to that store for the first time. And I am not talking the promotional prices here, just the regular prices; I understand promotions change and different people could have different coupons. But having the starting price change is a problem.

I am posting here in the hopes that someone can help make sense of this and maybe someone at Comcast can fix this issue before I take it anywhere else. All I want is to at least have my regular price match that of current offers.