Utterly shocking treatment / service

My mom has been renting a house for over 10 years. The property has not been maintained and as a result the Rental Housing Tribunal made a ruling to the effect that the property must be updated and some maintenance work must be carried out. Proficient Property Management sent a contractor out to the house, named Frank. When Frank was at the house he proceeded to shout and blame my mom and my grandfather, who was visiting at the time, for some of the repairs, that HE had, not done correctly. He threw his tools around and spoke in such a rude and disrespectful manner that my mom had to ask him to leave her home, My mom was so upset she called PPM to report the incident. When she called PPM and a lady by the name of Heidi proceeded to blame her for the incomplete repairs and even put the phone down in her ear. I then called and spoke to one of the Managers by the name of Tish / Trish. This manager was so rude on the phone and did not want to hear a word we had to say. I asked her to investigate the incident and that my mother deserves an apology for the ill treatment. PPM have taken no responsibility for the conduct of their contractor and are not even willing to investigate the matter or call my mother to smooth over the issue. My mom has sent several emails (with pictures) detailing her interactions with Frank to which they have not responded. Frank has been blaming my mother for delays on completing the repairs when in fact it has been due to PPM and / or himself. The blatant denial is shocking!!! what makes matters worse is that the oven was pulled out so they could replace the kitchen counter. They never put the oven back in place and the wires caused a short. My parents have now had to incur the costs of an electrician because PPM do not even want to investigate negligence on the part of their contractors. I am utterly disgusted in how they have conducted themselves and treated my mother. i told them that their company's name has been brought into disrepute as a result of this incident and all i want is a simple apology and some understanding from our perspective. instead all we get is rude responses and a failure to even attempt to repair the damage to their reputation. i would warn people against using this agency as they clearly do not care about the tenants in the properties that they manage. Their blind loyalty to their service providers has resulted in me having a very poor opinion of their management style and service. I am totally shocked.