Complain

I bought electricity online using nedbank app and forgot to register my meter number by mistake. I received an sms with token after purchasing electricity but it was rejecting . I went there to complain for the first time, they gave me a reference number and told me that I should wait for a maximum of 5 days for my matter to be resolved. I then later received an sms saying dat " Nedbank: As per service request ( ********** 2) your query has been resolved. Voucher Number: (2 ********** 0 ********** 4531). The above voucher has been issued to us for your electricity purchase done on the (03/10/2018) for (R200) to meter ( ********** 9528). Our Service Provider have confirmed this voucher is valid, kindly try this on your meter again or contact Ideal Prepaid (Your electricity utility) for further enquiries. Apologies for the inconvenience" and the meter number mentioned above is not mine cauz I forgot to register mine. I went to complain again and told them the metre number is not mine, they then asked for my metre number. I gave them and they said that they gonna solve the problem. Same thing repeated again and I went to the bank for the third time , they asked for my metre number "again" , I gave them but still sending the same messages with strange meter number. Up until today nedbank hasn't helped me or even refund my money. I lost my money to them just like dat because of a single mistake.