North Bihar Power Distribution Company [NBPDCL] — billing related issue

Sir, i converted my elctricity connection from ds1 to nds1 after clearing all due amount of previous ds1 connection and also buy new meter along with new nds1 connection, thereafter i use to pay my bill regularly whenever i notified by my phone pay app, in last to last i got a bill of rs.1608 only but suddenly in last month i got a huge surge in bill which of rs.22000, when i ask about this sudden surge in bill to reading man, he said that your meter number was wrong earlier.
So, please look into this matter as early as possible