Service Tax on Credit Card Interest

read the statement carefully, 

in credit card there are several bank charges for non payment, service charges are leviable on them 

for interest portion "interest tax " is leviable separately

Sir thanks for the reply,

service tax is charged in the statement on charges as well as interest portion.

As per my knowledge interest is not covered under service tax. I want to confirm that

finance charges are diff than interest ................

if they have charged service tax on interest specifically then u can ask them for details and return the same.