Individual — Lockbox

Mobile No. [protected], A/c No.[protected], Invoice No. [protected] dt. 01/09/2020, billing period 01/08/2020 to 31.08.2020.
Lockbox amount of Rs. 342 charged. What is lockbox and why we have to pay this amount.
Pl. give details in my E-mail [protected]@gmail.com.
Thanks,
Jamuna. K