Sim Swap Complaint

The Company is unable to assist me with a sim swap because their system does not have a record of the last five dialled numbers before the loss of my phone they have been out of stock of SIM cards for almost a month at Westgate mall my nearest shop I went to key west where there is stock but the problem is that there are no activities in the the last 30 days I really need help to retain my number how can I just loose a number I have been using for more than a decade it’s my life and again why do we Rica if we can not be assisted when we need help I so wish to port to a better service provider coz this has affected my banking life and everything else we use the numbers for please help me I’m desperate I have not been communicating with anyone for almost 6 weeks