Why haven't we been called?

While I am not intimately familiar with the sampling methods used by Canadian pollsters, I really would have imagined that give the volume of polling currently ongoing and give the fact that we have a listed number that we would have received calls for at least one poll by this point.

This amazes me because there is a lot of polling going on at the moment. My sense is that there are at least 4-5 publicly available national polls that come out every few days or so that typically have sample sizes of between 2000 and 3000 voters. Then there are the local/regional polls that are being conducted on a semi-regular basis. And finally we have the polls that are regularly being conducted by/for the 3/4 main political parties.

Given all of this calling (and the fact that non-responses necessitate more calling) how is is possible that we haven't been called at least once? The absence of calls almost makes it hard to believe that the reported volume of polling is actually taking place.