Poor explanation by consultant

So disappointed about standard bank home loan insurance. My geyser was tripping the main switch. I called the insurance to find out how they may assist. I asked the lady about excess amount her response was they will send the technician to check first. The guy came my husband was there .he checked the geyser problem was element then my husband asked about the payment the guy said its R600. Today he come element was installed then the amount for service was R700 not R600 my husband was no longer sure if the price is correct when he asked thw guy the said it's a discount .how can you discount R600 with R700. I m disappointed about standard bank First tht consultant was supposed to come back and explain to me wht will happen if it's the whole geyser or replacement of element nothing was explained. Wht makes ms angry the different amount . 2019 geyser was replaced and i was told how much i was going to pay. Before service. And invoice was there before they left now invoice was not there my husband asked about it .i only got invoice during the course of the day.