This is very sad bc the dog sounds bored and frustrated:( . Dogs can be taught anything with time, patience and consistency. They need us for love and guidance just like children and need to be taken very seriously when you decide to take on that responsibility, especially a rottweiler. As Judi said, contact your breeder and return him so he can go to a home that will invest the time this poor dog needs. This guy deserves more then being put in the basement everytime he does something wrong:( .
As Elisabeth said, can you afford vet bills

? Has he even been to a vet? Saying you can't afford training classes concerns me and tells me if you're unable to afford classes then what about the vet

.
I don't know how old you are but a responsible dog owner is one that does whatever is needed and that includes training and medical care, can you do that????
If you think you're having trouble now with chewing, etc. wait for another couple of months when he'll be close to 100 pounds and you want him to do something

. Do the right thing and return him and I hope to God you got him from a reputable breeder.
Your situation upsets and angers me!
Judy