I follow the steps to block the calls in the opposite way, i.e. I choose the function block/unblock the inward calls and by selecting it the calls are unblocked.
You will have to call your cell phone provider and ask them what they think they best course is, there might be a fee that you have to pay but I doubt it.
Follow steps, to block in opposite way. Choose function block/unblock the inward calls by selecting this feature calls are blocked. Contact local phone service to ask to unblock numbers.