Canara Bank — Online transaction cancelled but money not yet refunded.

Address:

North Tripura, Tripura, 799250

Respected Sir/Madam, Myself DEBASISH DHAR, bearing account number[protected], at Dharmanagar branch, Tripura, beg to state that while transacting Rs.16689.74(16, 500+189.75) on 1st of december 2016, at 14.49.26, as my college semester fee, from my Debit card, my transaction failed.
The auto generated cheque number of my transaction i found from my net banking account is[protected]. It has ben 7 days i didnt get my refund. I would request you too look over this issue and help me find a possible solution so i could re-pay my college fee soon.