Poor Client service

We activated our maternity plan with Discovery and were informed we qualify for benefits. We went to Discem to buy a thermometer for a baby but was declined due to our plan does not cover those items. Phoned Discovery and they told me i am mistaken, we are fully covered up to R5000 and our savings will cover the rest. We went back to Dicem and were declined again. Phoned Discovery again and they still tell me it is impossible. When they received the the NAPPI number they confirmed then, they do not cover that type of unit. When asked why, they could not answer me. I requested then for a list what they do and do not cover and was promised that list in 3 working days. It is week 2 now and still nothing. Here are all my reference numbers: ********** ********** 070 ********** 453 ********** 918 ********** 688851