A symptom is the beginning of an assessment
A door that will not move does not automatically need a new opener. A noise does not identify a particular replacement part. Describe what changed and let a trained technician assess the door, lifting hardware and controls as a system.
Ask for the fault and the proposed work to be explained before authorizing it. Confirm the business responsible, the written price or how it will be calculated, and any warranty terms. Availability, brands and appointment arrangements must be verified directly.