Hollard giving out the wrong contact numbers

I am truly hoping this will get a reaction out of Hollard, because nothing else does. You have a major internal issue... Your departments have been giving my contact number to clients instead of their own company contact details. I receive multiple calls per day from individuals looking for information that I simply cannot provide. This is followed up by incredible rude responses from clients and very poor customer service by Hollard. Devandree Govender has been my only point of contact at Hollard who has promised to do something about this issue but nothing has happened in the last 3 weeks. I cannot get hold of anyone in IT and no one else seems to know what to do.