Get rid of wasps who are taking up residence in our wall

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We need help in getting rid of wasps who are taking up residence behind our retaining wall. The wall is over 20' long and they are entering many different locations. We tried wasp spray but it doesn't seem to slow them down. There is a much longer tiered wall on the opposite side of the driveway that they don't seem to bother. We suppose they like the heat of the afternoon sun. We'll appreciate any suggestions.
q get rid of wasps who are taking up residence in our wall, gardening, gardening pests, pest control
q get rid of wasps who are taking up residence in our wall, gardening, gardening pests, pest control
q get rid of wasps who are taking up residence in our wall, gardening, gardening pests, pest control
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