Nebuliser defective x 2

Good Morning I purchased the nebulizer mesh PC Medic about 3 weeks ago, I have returned it to Dischem Table Bay mall as it was defective confirmed by the manager on duty, They swapped it out for a new one, The problem I am facing is that this one is also defective, it works for 30 seconds then it switches off or it works but no steam comes out, I bought it for my 72 year Old father who is dependent on it and this is starting to affect his health downwards as the machine again is defective. I work Monday to Friday and no dischem is near me, my father cannot drive, therefore the only time I can go to Dischem is over a weekend, which is starting to cost me money for petrol and very time consuming. I would like Dischem to sort this out by today, my father cannot breath and this is a big concern. Please can you be in contact with me this morning to send another brand to my office which I can take to my father. I do not trust your brand as it is the same problem. KInd RegardsCindy