letter vis certified mail(most leases state that's how you must notify landlords of all issues for it to count)with return receipt(so you'll have proof). Lastly, call 311 and report it, so they will send an inspector and then the city will notify the landlord they have so many days/weeks to address the problem. Personally, i couldn't take any more from the Mgmt. company as we had numerous issues spanning a year, this was our breaking point... i stopped paying rent, showed up at their offices screaming WITH bedbugs to leave for them since they thought it was so amusing to do nothing, they finally let us break our lease, and i didn't give any of the $$ we had been holding, but, informing ALL the neighbors we could, and showing them what bedbugs look like was one of the best things i feel i could have done, just to make people aware, SO many don't even know what they are until it's too late. Spread the word and it also might make your landlords FINALLY do something. Whatever you do, do not feel ashamed and do not let your landlords make you pay for anything, it's their responsibility-legally.