Deposit and outgoing final invoices

Paid deposit to the amount of R1350.00. On outgoing invoices at termination of service my last 2 invoices was sent, both dated 4 Dec 2018, and funny that by chance these 2 invoices both add up to,,, yes you guessed it, R1350.00 exactly. I requested photographic proof of the readings for the duration of contract, still to receive their feed back and explanation. This seems very suspicious.