Most teams do not refuse the CRM. They simply keep working the way that already works for them: a diary, a WhatsApp group, a personal spreadsheet, a good memory. The system is updated on the last day of the month, in a hurry, from notes, so what it shows is a tidy version of what happened rather than what is happening now. Nobody here is being difficult. The system was never made part of how the working day is actually run.
Why it persists. It persists because adoption is treated as an announcement rather than a change of habit. The system is switched on, a demonstration is given, and everyone is asked to use it. Meanwhile updating the CRM costs a seller time today and pays back later, while the manager still accepts a verbal answer in the review. As long as the shortcut works, the shortcut wins. Training alone does not fix it either: a classroom session is forgotten within a fortnight unless the daily work changes with it.
If it stays unresolved. Left alone, the gap widens. Data ages until cleaning it looks impossible, so the team trusts it even less and records even less. The licence renews, the reporting stays manual, and the next tool you buy inherits the same habits. Eventually the CRM becomes the place where enquiries are stored after they are already lost.