My mac address is blocked even no one have my wifi password then who else can block my mac address

I was using internet on my android mobile. Suddenly my access to internet was blocked, I connect my other device to same wifi but this device was working fine on same network but only my mobile was not working... but my mobile was working on my neighbour's wifi indicated that my mobile was fine.... I went to my internet provider and he solved my problem but didn't give information about the problem... he said some problem could not be explained to users... after that I searched it on google then I got thet the problem was with my mac address... my question is that even no one have my wifi password and no one have access to my internet... im the only user... so who else can block my mac address?
Asked Mar 23, 2017

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