Unwilling to help

I have a MTN number but I am currently living in the UK. After I experienced water damage to my phone I lost all my data including WhatsApp and need to reinstall it. Whatsapp is still connected to my South African number and I don't have the sim with me to verify the number. I am trying to get in contact with someone to see if they can try and help me verify the number and the only answer i got from multiple people was "my apologies we are not authorized" or "go into your nearest store". I cant do that, I am in London! Something they were not listening to. Also international calling is expensive and your customer care put me on hold for 5minutes and forwarded me to a number that rang out. CAN SOMEONE PLEASE GET IN TOUCH WITH ME TO RESOLVE THIS! I know I am just one of many customers but taking the time to LISTEN to a query from an individual customer and the willingness to help goes a long way. The fact I also have to write a review like this to try and get some assistance is ridiculous. Please can someone help me urgently or the next phone call I make will be to cancel my contract as soon as I am back in the country.