no one gives you complete cure. If they claim its false. However it can be brought under control. First identify what the things which provoke allergic cough
and try to avoid those things. If you have any particular allergy you can go for desensitization therapy.
Cost of treatment depends upon where and which type treatment you receive. My advise is first consult physician and get your blood test
done especially Absolute eosinophil count
. If these are raised then go for allergy treatment. If these two are normal think other cause for cough.
if you have any querry u can ask