So I now paid for 5 pages but it cannot be used? So I lost money? Why a new writer cannot work with existing content and only add new content, is it normal?
This is not a normal practice. My guess is that the writer you hired outsourced the paper writing for the 5 page trial order. Now, you were satisfied and everything but, the writer that he shared profits with, the writer who did the actual writing suddenly became unavailable. Hence the refusal to write 15 more pages. That is the first case scenario that came to mind. The second scenario, is that the writer managed to complete 5 pages. Simple enough. However, he does not have the writing ability and research prowess to actually complete a 20 page paper for you. Which is why he took the money for the 5 pages, but refuses to follow through on the remaining 15 pages. As for hiring another writer, that will be difficult because every writer has his own writing style. You would do better using the 5 pages as a basis for the new writer to completely write the 20 pages on instead.