Punjab State Power Corporation [PSPCL] — bill have been paid twice

My account nmbr is[protected] under name satish kumar. Errornously latest bill has been paid twice. First it was paid at cash counter manually at nangal on 14 nov & 2nd was paid throught net banking on 19 nov. It happend because i didnt intimate my family member regarding the 1st payment. But it was fault at company's end that even after 5 days the bill was not updated which causes double payment of the same bill..