Extremely unprofessional and unpleasant experience with the technician from Cape Town

In summary:

1. I was sent an invoice including work done that I was not quoted on and did not approve. 2. Invoice was sent at 22h00 over WhatsApp 3. After I told them that we would pay even though we were not happy with what happened, they continued to harass me, saying that the invoice was due the previous day. The invoice that they sent at 22h00 the previous night.

I arranged with Coolflow for a technician to come out and look at what was wrong with my airconditioning unit as I was unsure. I was informed of the callout fee (R450), and told that the technicians would do an inspection and quote me for any work that needs to be done on site. The technicians arrived late, but that I could overlook. They inspected the unit, and tested it with a remote that they brought (old, and yellowed). The remote worked. They then inspected the unit and mentioned that it would need regassing. I said "ok", and waited while they continued to inspect the unit. I then proceeded to answer an urgent call while I assumed they were still inspecting. About 20 minutes later they came to tell me they are ready to leave.

At 22h00 that evening, I received an invoice for R5000. This included work aside from regassing that was not approved. As well as R550 for a spare (used) remote that they had with them. A remote that can be ordered online for R150. I responded to ask about the additional work that was not quoted or approved, and they simply said that the work was done so now we need to pay. I explained my concerns and they offered 10% off. I old them i would send the invoice to my landlord in the morning.

The next morning around 9h00, they followed up via whatsapp. I told them that my landlord had the invoice and while they were unhappy, they were willing to pay. I was then told that they don't care about the landlord and I need to pay. I told them that payment would be made on the same day as soon as my landlord gets to their office. They continued to harass me over messages, saying that the accounts department are waiting for payment and that it was due the day before (reminder - the invoice was sent at 22h00).