Banking app-lost payment

In end March 2018 I made 2 EFT payments via banking app to another account. I receided proof via cellphone. ..After about 3 weeks later I received a phone call that the 3rd party to inform me they didn't received payment. After investigation (proof of payment) was send to the 3rd party and Nedbank, and was assured of an investigation after 8 months no response from Nedbank. Phone calls and emails NO RESPONSE whatsoever...