Poor customer care

I called the institution to have unit in my vehicle checked for operation. The agent on the line spoke so unclear that I could not understand what she said. I sent a e-mail to have unit checked. They only came back to me 10 days after the e-mail was sent. They then told me my subs was in arrears. I disputed that. Two conflicting invoices were sent to me. I queried this. Six days later they came back to me with a different story. I subsequently cancelled all dealings with them because I cannot trust a company that can not even control their own finances.