Mislead and overcharged

I called the Bosch Northway Service centre on Friday 22 Apr 2022 looking for a quote to service my vehicle. I was told by Adrian that it will cost 2.5k to 3k dependent on whether the diesel filter needed replacing. I then called a competitor and was told that for this service the air filter, oil filter and the diesel filter all definitely needed replacement and I was quoted 2.8k by the competitor. I then called Bosch back and said, yes the diesel filter is required to which Adrian rep****, "well in that case it will be R3,000". Although R150 more expensive I thought to myself, lets go with Bosch, its a good name and agreed to bring in my vehicle on Monday morning 25 Apr 2022.

When I collected in the afternoon I was handed an invoice for 4.3k. I complained to Adrian and reminded him of the agreed price of 3k. To reduce the price he said "ok I'll take off the diesel filter". I understood that to mean being taken off the invoice (to match what I was quoted) but then I sat around for another 45 minutes like an idiot while they physically put the previous diesel filter back in