Hollard debit order still going off after i canceled.

I have canceled my Hollard Legal aid in Feb. but up until today they still take money out of my account. and its 29 May 2018. I phoned them to query it and spoke to 3 different agents and still nothing sorted out. I need someone to phone me back that can resolve this problem. cause I want my money back. they can phone me on my land line ********** 807