Cough for more than 8 weeks is called Chronic cough
. This can be due to many reasons ranging from lung issue to heart, medications, allergy including asthma and also acid reflux
from your stomach.
Do you have any other associated symptoms like blood with the mucous, fever, breathing problem, weight loss
, night sweats
Cough with mucous could mean you possibly have/had bronchitis. Do you smoke ? What is the colour of the mucous ?
Are you sure you had MRI scan ? Normally after Chest X-ray it is CT scan and not MRI scan.
Best idea is to revisit the same pulmonologist and try to get a detail explanation about the bizarre call from the secretary !! or check out a new place and repeat all test, like detail history, clinical examination. sputum test, Chest X-ray (avoid CT scan if not necessary coz it is lot of radiation) but MRI has minimum radiation even though it is not indicated for your problem.
You might need a spirometry
or full lung function test.
Would be happy to give further information should you require.