Mahanagar Telephone Nigam [MTNL] — landline bill for the month of feb.2018 paid twice

By an oversight i had paid my landline bill of mtnl delhi for the month of feb.2018 twice. I find that the excess amount so paid has not been adjusted in the next bills for the months of march 2018 as well as april 2018 despite my repeated requests. As such it is requested that the excess amount so paid may please be got adjusted to wards the bill for the month of april 2018.