BECAREFUL OF THE FALSE ADVERTISING FROM MTN

I took a Home Internet Pro Month to Month contract with MTN, 2 months later I get an email that the premium will increase and at the same time they reduced my FUP from 400GB to 300GB. They are quick to advertise "Cancel at any time and bring all equipment to your nearest STORE" I went to 2 STORES in (PE) and both stores say they cannot cancel it as this needs to be cancelled online. I get an email from MTN CUSTOMER DONT CARE saying that that I need to take all devices to my nearest store and the store will cancel the contract. I cannot cancel it online nor can I cancel it at your stores. MTN CUSTOMER DONT CARE and the stores are blaming one another. I NEED THIS CONTRACT CANCELLED TODAY. I will be referring this to the CONSUMER PROTECTION ACT.