Sim Card Blocked/recyled for someone else.

i have been using my mtn mobile number for over 10 yrs. one morning waking up my number was blocked, didn't know then but people telling met that my phone is off. funny I can make calls but cannot receive calls. I reported this to MTN and they told me of technical problem that willtake 24 hours to be sorted. 4 days past and I reported it again and nothing helped. I went in to their branch at Greenacres, the lasdy went into their system to check what was wrong with my phone. they could not pin point the matter. so we dicided that I must do the sim swap to my surprise I had to buy the simcard in order for the to simswap my number. after that simswap, still my number is not working, still blocked. I left with disappointment that I had to use a new number now and I had to change my number for lot of things, my bank, and everything that I do business with is affected. last week someone whattsap me and told me that my number is being used by someone else. when I call this person he told me that he bought a new sim card at MTN and got the number to my surprise. I call MTN and told me they reciled the number because it wasn't used, the question to them is, why they didn't recycled it when I reported it if they have a solution. I fell like this is bad service on their part. I lost a lot of airtime on that sim card but they didn't care.