Admin do not record information sent to them on their request

I bought my car in November last year (2019) and received an insurance package as part of the purchase deal. The details of the insurance policy were provided to Wesbank at the time of the sale of the car to me by the car sales company. In March 2020 I received an email and sms saying that I needed to provide proof of comprehensive insurance to Wesbank. This I did on 17 March. On 18 March I received confirmation that the insurance policy was received and all was in order. On the 5th of June I received again an email and sms saying that I needed to provide proof of insurance. I sent the policy documents on the same day and received confirmation of receipt and that all was in order on 8 June. On 30 June I sent the insurance details again and this time I did not receive any confirmation of receipt. On 3 July I received another email saying that I must provide the proof of insurance. I did this immediately on 3 July and I uploaded the details to Wesbank's website. I received confirmation that all was in order on 9 July via email and 15 July via sms. So now today (24 Aug 2020) I received a phone call (which I unfortunately missed), an sms and an email telling me to provide proof of insurance. I have sent it again after a very unhelpful discussion with someone who looked at my records and can find no evidence that I ever sent anything! I don't know how else I can ensure that Wesbank records the information that I send. The finance from Wesbank is great but it seems that their admin department is useless.