Norton Lambrianos attorneys and their systems

On the 10 March I made a payment to Norton Lambrianos towards my Vodacom account and on the 11 March I submitted the proof of payment to a WhatsApp number they provided. Someone confirmed receipt of pop and the payment and they said they would allocate everything accordingly. Since then I have been receiving calls from the same lawyers’ offices asking me about the payment. I gave every time, explained what had happened and each person that I spoke to would confirm that on looking further into the matter, the payment does appear in the system, they would just need to have it allocated against my name but somehow that doesn’t seem to happen. I am tired of being harassed by them and if my name ends up black listed because of their incompetence there will be even bigger problems.