Customer Service and Technical Support both have their roles in organizations. However, there are significant differences between the two.

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The Release schedules show two freeze dates: Soft and Hard freeze. What's the difference between Soft Freeze and Hard Freeze?
Before knowing about the advantage of customized software, one should know why it came into existence and why all the business owners are looking for customized software. There is always a limitation in un-customized solutions. Even if your business software has unlimited features, you cannot expect profit from your business if those features are not relevant to you.
A PoC and a prototype are used at the pre-product stage and require minimal-to-medium investment. With MVP development, you enter a product stage with core functionalities and features to see how the market receives your idea. Building an MVP requires more time and money than creating a PoC or prototype.
An estimate is a best guess of how much a job might cost. A quote is more exact. Once you've accepted a quote, the contractor has to do the work for that price.