An online video of an argument at the cafe and scathing visitor reviews over the years sparked a visit from police in June to offer the Cullingfords some customer-service advice.
Karl Hardaker and Bronwyn Squires bought the building last month from former Selwyn mayor Bill Woods, after it had been leased to the Cullingfords for nearly 10 years, Stuff reported.
Christchurch's Col Henderson said "never have I struck such a rude person".
A former customer wrote: "Probably the most sour, rude, and paranoid ever. Asked when pies were made and the lady immediately went into attack mode. Simple question simple answer, not for her. It was like I had insulted her. I hate this place and will never go back."
There have been two five-star reviews in the past month.