Greetings~

I purchased a mandevilla vine called 'Red Fury' from a greenhouse weeks ago. IT was the last one and I was hesitant to purchase because it had a couple of brown crispy patches on a leaf or two and a couple of yellowish leaves. The owner said, "oh yes, it will come out of it, just fertilize it". Like a dummy I did buy it. I repotted it, fertilized it, and it just seems to keep getting brown patches on the leaves and it has dropped a couple of flowering buds? Can you help?