Collecting of router

Received a call that I’m going to be charged for a returning of router ,the technicians attempt to collect it 3 times !nobody has contacted me to collect since the day of cancellation.In order to gain access where I live you must call me !No body ,my question now is how did they “attempt “ to collect 3 times without contacting me .Now I’m told I’ll be chargers R1999 if I do not return the router to their offices 😡😡😡😡How is this my fault ????