Indian Bank — refund not yet credited to my account even after 5 months

Sir, i have done a transaction from amazon and sucess but i canceled it so there was refund amount initiated from their end on 15/05/2019 and the reference no is[protected] but the amount rs 198 has not been credited in my account till date and continuously i am contacting customer care for this but not getting a reply for this. As per them contact branch for complain, they put an ip from there side whenever branch contact to the department they said today will credit it but still in pending no action is been taken. Please look into the matter at the earliest. Please look into this matter as its very serious.