I have a small amount of sympathy for RR - but only a very small amount.
She was told by an employee of the agency that they would apply for a licence for her, so she could reasonably have expected them to do so.
BUT when the months went by, and she had not received any confirmation that it had been done, or been asked either by the letting agency or the council to pay for it, why did she not realise and query it?
Why, especially if the specific agent she had been working with had left, did she not follow up on it at all just to check it was being taken care of?
I know I would be checking up on stuff like that - especially if I was an MP and knew I had to 100% play by the rules!