No resolution from Discovery HealthyFood

I started corresponding to Discovery Vitality - Health Foods on the 19th August 2025. I realised that I am not receiving any Discovery Miles for HealtyFoods through Sixty60. Their most recent communication to me was that I need to ensure that my XtraSavings Card is correct, because on their side it showed a duplication. I sent them e-mail confirmation from Sixty60 that the correct XtraSavings card has been loaded. Nothing wrong on my side. I received last email from Discovery HealthyFoods on the 19th September confirming that they are waiting for feedback and that they will get into contact with me as soon as they have feedback. Today is the 28th September and I am still waiting . This matter has now been unresolved since 19th August. I lost thousands of Discovery Miles since September last year to date and I did everything right on my side. I ensured as per their website that the Xtra Savings Card is linked to my ID, and I sent formal confirmation of that from Sixty60 to them. Why does it take from 19th August to date to get this matter resolved??? Really not impressed with Discovery Vitality (Healthyfoods)