Impaq - bad service

Registered both sons for 2019. Delays in delivering the material and their call centre didn't answer calls for almost a week due to high call volumes. When books were received not all the books were provided. This is totally unacceptable levels of service. Call centre provides no ref number for calls or you are kept waiting indefinitely. Issues with books are still not resolved. Worst service I have experienced in a long time. They blame the couriers and warehouses but haven't resolved the issues