Unfortunately, some things arn't always possible. Even hosts that promise "unlimited storage and bandwidth" generally do start to impose restrictions if you are placing a heavy load on their systems.
Financially and in a business sense it just isn't feasible. If you could have unlimited storage and unlimited bandwidth for a low price you could upload a
website hosting that is a few thousand gigabytes and transfer tens of thousands of gigabytes a month which cost the host huge amounts and would eventually put it out of business.
Most of the time you find that even though you want "unlimited space and bandwidth" in reality you never end up using as much as you think you will, at least at the beginning. I always looked for these features but in the end, I realised "did I really need it?" and the answer was no.
Also you find hosts who do try and offer this generally collapse and close down very soon or end up having to withdraw the offer of unlimited storage and bandwidth.
The bandwidth and storage amounts on the platinum plan are quite big. How big is your
website hosting and how busy is it? - it sounds like you want to host a
website hosting like microsoft.com from what you are wanting!!!
.