Unable to use Discovery Miles for a 2nd w running

we have been attempting to use our discovery miles when online shopping on 2 occasions now- we keep on getting a technical error message. when we call the customer care line, we get the standard 'the technical team is working on it' with no time frame for resolution. why give away and publicize your miles so aggressively, if your clients cannot even use them? I find this totally unacceptable and frustrating. your lack of communication further compounds the problem. we have been saving up our miles to purchase luggage for an upcoming trip so this is very disappointing. <div><br></div><div><em>(Supplier name changed from Discovery Vitality &amp