Hi Ali, I'm sorry your pup got stolen, how on earth did that happen?!
Anyhow - if the white patch isn't very large, it may disappear by about a year old...otherwise it's not a problem unless you plan on showing your dog. It's quite a common fault, I had a Rottie with a white spot that never went away.
I would NOT send your dog away to be trained in seven days - DON'T DO THAT!!!! Please. :) For one thing, training is an ongoing thing, it simply does not get "done" in seven days, never mind with a 5 month old puppy. That is absolutely ridiculous.
Any place that is making such a claim does not deserve one single penny of your money. YOU need to learn how to interact with and train your dog - God knows what these people are doing to train your dog, it is an awful idea and not common practice, bad bad bad idea - have I made myself clear? :)
Find a good beginning obedience class that uses positive training methods, and go to it - with your dog. I know for a fact they have those where you live. Then keep on with the training until he's about two years old, because as he matures he'll keep needing reinforcement, and will go through all sorts of phases.
Also I strongly urge you to get a good book about training and dog behaviour - Rottweilers for Dummies, anything by Ian Dunbar, Jean Donaldson...I'm sure others will have suggestions. I think you really need to educate yourself about Rottweilers, training, and dogs in general. (I mean that in a nice way.)
Do a bunch of reading on the various forums here, I think you'll find it very interesting. There's a lot of very knowlegable people here.
And promise me you won't send your dog away to this place. It sounds terrible.