Bad Customer Service

I have been trying to call old mutual to cancel my tax investment and I have spend hours on the phone no one answers the call, i have spend more that 400 for airtime to call them and still not being assisted. i then decided to send them my documents to cancel and no one responded to my e-mail except the automated response e-mail ,I have send my documents to '***'; '***'; '***'; '***'.I regret why did I even take it as I am getting really bad service