Basic Package is centered around quality and not quantity. Scaling Package takes care of quantity. The aim of the Basic Package is to get your costs as low as possible, so when you increase the budget on them, the costs changes as little as possible. The budgets are kept low, and hence your impressions, clicks etc are low in quantity.
However, there is no reason to panic as this is the optimisation phase and there's nothing wrong with the campaign. If you still feel that budget is not the reason, feel free to contact me.