bad bad bad service

January I took a tracking device with Matrix (Beame) I never received an invoice until 26 Jan for R200 but I no debit was made on my account, on the Feb I received another invoice for a R300 and still this time no debit was made on my account. Furthermore I received a call from scs debt collection that I have missed my payments and I’m in arrears. This got me mad and I requested a cancellation and I received a letter that I must pay cancellation amount by 25th March and I have done that but on the 24th April I received another call that I have +R400 that I’m owing then I requested for an invoice for that 400 and I haven’t received it. on the 30th April 2019 I made a payment of R400 then when I made a call to Matrix I was told that my account was cancelled and there is even money that is due to me. Can someone please send me an invoice of that +R400 that i'm owing and how come that I owe it. I took a contract to pay R100pm even if I had to pay that outside the cancellation fee it was/is supposed to be R300 which is for Jan,Feb and March.

I sent an email on 30/04/2019 but i only received an email saying that they logged a query ********** 2 and to this day i haven't received any communication from them