Still suffering a traumatic life experience from scammers

The darkest day on my life (15 November, 2019):

I started my day like all other normal day and was studying for my upcoming exam. Suddenly got a call which says the call is from RCMP and they found some illegal activities like money laundering happening under my SIN. I was surprised because I was not even working anywhere with my SIN. Their phone number was identical to the local office police number. I explained that I was not working and busy with my six courses. They told me that they understood I am not guilty but someone else is doing this activities with my SIN and I need to secure my money from the bank as the suspected criminals might have my information and can take my money away. Then they told me to go to the nearest convenience store to buy gift card of $500 CAD as I had around those amount of money in my account and also threatened me that if I disclose the matter to anyone else, they will inform local police and the police will come right away to arrest me. I got really frightened and bought gift cards. Then they asked me to tell the numbers of the cards. I asked them why should I do so? If I tell you the digits how can I use it? They told me that if you do not tell us the numbers we can not verify you are following our instructions. They promised to send the money as a form of cheques on the following day. Then I was convinced and told them the digits. Following that, they kept threatening me and pushed me to buy other gift cards from different stores with my credit cards as long as the credit card limit went to nill. The total amount was $4300 ($3000 from apple store, $1000 dollars from Sobeys and $300 from Walmart). They just made me cry to keep torturing me mentally. Next day I was waiting for the cheques but it was all lie. Then I went to police and made a report and told them the scammers called from their numbers. Police felt sorry for me and told me that the scammers make up their numbers from some apps. I was really concerned about the money as the bank denied to reimburse the money because the scammers made me buy the cards. Then police told me there is 50-50 chance to get the money back. Unfortunately, within a month police called me and told me they investigated my case but they could not recover the money. On the other hand, Bank is charging me interest rates every month, as a result the due amount is pilling up. For an international student like me, the amount I lost is near to my one semester tuition fee. So, it is a huge loss for me and I am just clueless how to get out of this terrible situation. My single mom can not manage my living cost let alone the due amounts. Additionally, Covid-19 affected our financial condition too bad. I hope you, the kind souls over here, would come forward to help me fight with this distressing life and get back to my normal life again. Thanks a lot .