Now they double charge me #doublethetrouble

Good day,

its exactly more that a month ago that cell c has collected the 2 phones I requested for a cancellation for. On the 07th I received a statement, they are charging me an arm and a leg for the phones they collected on the 05th of October. When I call they say they still want to confirm if these phones were returned. I mean how does that work, just the other day, someone called me to confirm the WAYBILL number for the collection. I phoned still even today and they are still escalating this issue Ref # **********.