While/when I was riding my motorbike, the chain broke.

I was riding my bike when the chain broke. It didn't "get broken". If you say it got broken, than means something broke it. The paragraph is slang English. "Got broke" is slang English.

it happened to me 3 days ago

the complete sentences was: " Last night my boss said to me: ricardo take this order to the avenue flamenco 876.. so when i was driving the fucking chain of my motorbike get broke and i could not give the order at time given. so when i arrived to the costumer house he said : im sorry man i called and they told me that the order is free. I hate giving free orders!!!!!! """"