cost of calls

I registered early for ZIP and waited eagerly to be able to make cheap overseas calls which i do often. While waiting I traded the share in and out a few times with a net success. When the day arrived I signed up and lodged a credit. To my dismay the credit was quickly swallowed with flag fall even for missed calls. I topped again and same result. Unhappy with first impression I cancelled never to return. I find 2 main competitors with less bullshit and better price. I never see a bad word about ZIP, surely I'm not the only one.