Incorrect water readings and high amount charged on my account

I have lived in a Complex since 2005 and am very careful with water. Each time I go away I close my water from the meter and even request our Caretaker to keep on checking it for me. On the 15th of December 2023. I had to rush home to take care of my sick Mother. I left no one in my unit and the Board of Trustees was aware since I am one of the trustees. I only got back on 1the 4th of January 2024. On the 30th of January I got an email with contents below from Impact Meters Services "Kindly note that water usage at the above mentioned unit has increased for the period of : 21/12/2023 - 23/01/2024. Water usage: 226 - 176 = 50 kl R 2 115.83 excl VAT for water and sanitation". I informed our Caretaker he came and checked all my taps and found no leak, he checked the meter and there was nothing wrong with it. They sent their technician and he said there was nothing wrong. They now suggest we find a plumber to check the pipes. My question to them was what if the plumber found no fault, what would that mean? I cannot agree to make payment arrangements for something I did not use. my bill now stands at R3000+ due to this. I live alone and even if I was around at the period they indicated above, there is no way I could have used up such a high amount of water. They have sent pictures of the readings, but I still do not agree with the readings and the amount indicated on their email and the invoices. I would appreciate it if you can intervene.

Regards

Sophy