Punjab National Bank [PNB] — complaint about poor service to customers

Bank is not processing the amount initiated by myntra amount was about to credited in 3 parts separately as i have returned 3 products two of which bear the same amount 377 and 377 now i got only one amount of 377 rs one is they are not crediting saying my account is already credited. I have sent manyails but they are replying the same account is credited but they havecredited only one amount of 377 rupees they are confusing with the same amount however two separate refrence number are also shared for both the articles.