Roamwild pest off bird feeder - Bird proof ?

Out of desperation due to a magpie invasion on my conventional feeders I spent £60 on both the nut and also nut feeder.
Whilst they certainly keep the magpies away, over the past 10 days I have not had a single bird on either feeder.
I appreciate that in late June song birds have plenty of other natural food sources but this is very frustrating as well as costly.
I wondered if anyone else has had a similar problem with these particular feeders ? Are there any alternative solutions ie adapting these feeders or any others on the market ?