Deviation to contract

I renewed my data contract in March 2022, in june I discovered they have not been giving me the date a signed up for, It was then suggested that I get into a new package which I did, in September I discovered that once again they are not giving me the 60 gig I signed up for but are giving me 20gig instead. I spent 3 hours and had to recharge my airtime just to get hold of someone to assist. Can MTN please sort this out or cancel the contract