IGST or CGST and SGST ?

Sheetal Devaki (Proprietor) (171 Points)

04 March 2019  
GTA having registered office in Karnataka only. Daily sends parcels from Karnataka to Maharashtra and cherges CGST 2.5% and SGST 2.5%. while parcel from Maharashtra to Karnataka IGST 5% charged.
Is aforesaid method is correct ?