Sharraxaadda

we have had an issue with bed bugs for at least three years and instead of hiring a good exterminator she hires the cheapest. I called and asked about this before and was told the entire unit should be done and only one apartment is done at a time and all they did was spread .W e now have them in our unit and the exterminator said he didnt find any so he did a preventive measure on three apt. needless to say they are still here and the tenant is treating them himself .P lease we need help with this matter