Vendor contracts have 1-3 year terms. We (a financial services firm) re-evaluate tech vendors every year for potential replacement and technologists have direct input into these processes. I understand others may operate under a different vendor strategy. As a vendor customer, your choices are to remain a customer or to leave and find another vendor. These are not feelings, these are facts. If you are unhappy but choose not to leave a vendor, that is a choice, but it is your choice to make, and unless you are a large enough customer that you have leverage over the vendor, these are your only options.