Factoring can be very beneficial, as long as you are with trustworthy people with the finances to back your invoices, and they aren't taking too high of a percentage. Ultimately, it has to work for you.
Factor expressions, also known as factoring, mean rewriting the expression as the product of factors. For example, 3x + 12y can be factored into a simple expression of 3 (x + 4y).
Get a Release Letter: Once all obligations are fulfilled, ask for a release letter from the factoring company. This document should state that you have fulfilled all contractual obligations and that the factoring company has no further claim on your invoices or receivables.
What is bank factoring? The name, bankfactoring, might suggest that it is the bank that provides factoring services, but this is a simplification. It is not the banks, but actually companies specifically delegated by them to use bank capital, that offer factoring.
Writing--or hiring an attorney to write--a contract cancellation letter is the safest way to go. Even if the contract allows for a verbal termination notice, a notice in writing provides solid evidence of your decision, and it's always a good idea to have a written record.