ma-i have a tenant which is tenancy at will.the other day they sent a rude a vulgar letter to me .i sent them a certified letter stating they have 1 week to apoligize or eviction would proceed.they sent me a letter back stating the would not and stated we had called them a name back in setember which we did not we told them to stop screaming at midnight inf ront of other tenants windows.please help i do nto know what to do from here.i have had other problems with them.this is not the first time.they do pay there rent every month on time but there attitude is horrible .other tenants have complained about them also.