Very unprofessional and unpleasant experience with Cape Town branch

1. Was invoiced for services we were not quoted on and thus did not approve, as well as a used replacement remote that they charged R550 for, which can be bought new online for R150. 2. Invoice was sent at 22h00 over WhatsApp. 3. I queried the invoice and was offered 10% off. I told them I would speak to my landlord in the morning. 4. The next morning, they followed up on the invoice. I informed them that my landlord agreed to pay, even though they were unhappy. I ensured them that payment would be made on that same day as soon as my landlord got to work and emails. 5. They proceeded to harass me with more messages, saying that they don't care about my landlord as they were dealing with me. Asked me how I will proceed, and what time payment would be made. 6. They insisted that payment was due the previous day already, but the invoice was only received at 22h00. 7. Received a phonecall after I asked about which branch the technician came from and about the cost of the remote - telling me that I am problematic and they have 100's of customers, and I am wasting their time.